O
- office noun (an office, offices)
An office is a room or building where people work at desks, often with computers and papers. - officer noun (an officer, officers)
An officer is a police officer, a person whose job is to keep people safe and make them obey the law. - official adjective (official); noun (an official, officials)
Official means approved by people in charge, like a government, school or organisation. - officially adverb (officially)
Officially means in a way that is approved by people in charge, according to the rules or the law. - officiate verb (officiate, officiates, officiated, officiating)
To officiate at a wedding, funeral or service is to lead it as a priest, minister or official. - officious adjective
Officious means too eager to give help or orders when nobody asked for them. - offshore adjective (offshore); adverb (offshore)
Offshore means in the sea, away from the coast. - offside adjective and adverb (offside); noun (offside — the offside rule)
In a position on the field that the rules don't allow, usually too far forward, ahead of the ball or the other team's last defender. - offspring noun (offspring — same form for one and many)
1) Offspring are the young of an animal or plant: its babies or seeds. 2) (formal or jokey) A person's offspring are their children. - often adverb (often, more often, most often; also oftener)
1) Often means many times. If you often play, you play a lot. 2) «How often» asks how many times something happens in a time, like each… - ogre noun (ogre, ogres; feminine «ogress»)
1) An ogre is a huge, frightening giant in stories who eats people. 2) An ogre is a very cruel or frightening person, as a joke. - ogress noun (ogress, ogresses)
1) An ogress is a female ogre, a huge, frightening giantess in stories who eats people. 2) An ogress is a fierce or cruel woman, as a joke. - oil noun (oil — uncountable; oils — kinds of oil); verb (oil, oils, oiled)
A thick, slippery liquid that does not mix with water, from plants or animals, used in cooking: olive oil. - oilbird noun (an oilbird, oilbirds)
1) A brown, night-flying bird of South America and Trinidad that lives in caves, eats fruit and finds its way in the dark by clicking, a… - oily adjective (oily, oilier, oiliest)
Covered with oil or containing a lot of oil: «oily hands», «oily fish». - oink noun (an oink, oinks); verb (oink, oinks, oinked, oinking); interjection (oink!)
1) An oink is the grunting sound a pig makes. 2) To oink is to make that sound. - ointment noun (an ointment, ointments; ointment — uncountable)
A smooth, greasy cream rubbed on the skin to heal cuts, burns, rashes or sore places. - oireachtas noun (the Oireachtas) — (Ireland, a name)
The national parliament of Ireland, made of the President, the Dáil (lower house) and the Seanad (Senate). - ok adjective and adverb (OK, okay); exclamation (OK!); verb (OK, OK's, OK'd, OK'ing — informal)
All right; acceptable; good enough: «Is it OK if I sit here?». - okapi noun (an okapi, okapis)
An okapi is a shy African forest animal with a brown body and black-and-white stripes on its legs, like a zebra's. - okay adjective (okay, also OK); adverb (okay); exclamation (Okay!); verb (okay, okays, okayed — to approve, informal)
Okay means all right, fine, not hurt or not upset: are you okay? - ola fragment or name — not a common English word
1) Not an English word on its own. It may be a piece of a longer word, as in "cola", "granola" or "Coca-Cola". 2) It may be a name, like… - old adjective (old, older, oldest; elder, eldest for family); noun (the old — old people)
Old tells how long someone or something has lived or been: «Tom is 7 years old». - olden adjective (olden — used before a noun, mostly in «olden days» and «olden times»)
1) Olden means belonging to the long-ago past; «in the olden days» means a long time ago. - older adjective (comparative of old)
1) Older means having lived more years than someone else. 2) Older means made or used longer ago than something else: «an older house». - olfaction noun (olfaction — uncountable)
1) (science) The sense of smell, or the act of smelling. - olive noun (an olive, olives; olive, uncountable for colour/oil); adjective (olive — colour)
An olive is a small oval fruit, green or black, with a stone inside, that grows on olive trees and is eaten or pressed for oil. - olm noun (an olm, olms)
1) An olm is a pale, blind salamander (an amphibian) that lives in dark underground cave waters in southern Europe, especially Slovenia… - olympiad noun (olympiad, olympiads)
An olympiad is a contest where pupils solve hard problems, for example in maths, physics or chess. - olympian adjective (also noun: an Olympian)
Olympian means belonging to the gods who lived on Mount Olympus in Greek stories. - olympic adjective (Olympic, usually with capital O); noun (the Olympics)
Olympic means about the Olympic Games, the biggest international sports competition, held every four years in summer and winter versions. - omega noun (omega, Ω, ω)
Omega is the last letter of the Greek alphabet, written Ω or ω. - omelet noun (omelet, omelets; British spelling «omelette», omelettes)
An omelet is eggs beaten up and cooked flat in a pan, often with cheese or herbs. - omelette noun (an omelette, omelettes; also omelet)
1) An omelette is a dish of beaten eggs cooked flat in a frying pan, often folded over a filling such as cheese, ham or vegetables. - omen noun (an omen, omens)
1) A sign or event that some people believe shows that something good or bad will happen in the future. - ominous adjective (more ominous, most ominous)
1) Ominous means showing that something bad is about to happen; it is a warning sign. - omission noun (an omission, omissions)
1) Something that has been left out or not done. 2) The act of leaving something out (the omission of a word). - omit verb (omit, omits, omitted, omitting)
1) To leave something out, on purpose or by mistake. 2) (formal) To fail to do something: «He omitted to tell us.» - omnibus noun (an omnibus, omnibuses); adjective (an omnibus edition)
A book or TV programme that puts several stories or episodes together in one. - omnivore noun (an omnivore, omnivores); adjective form: omnivorous
An omnivore is an animal that eats both plants and other animals. - on preposition, adverb; adjective (the light is on; the game is on)
On means touching the top or side of something: on the table, on the wall. - once adverb (once); conjunction (once); noun (the once — casual)
1) Once means one time. 2) Once means at some time in the past: «Once there was a king». 3) Once can also mean «as soon as»: «Once you… - oncoming adjective (oncoming)
1) Coming towards you or moving nearer: «oncoming traffic», «an oncoming storm». - one number (one, ones); pronoun (one, ones; one another); determiner; adjective (the one and only)
One is the number 1, the first and smallest whole number above zero. - oneida noun (Oneida, the Oneida); adjective (Oneida) (a name)
1) A Native American people, one of the Six Nations of the Haudenosaunee (Iroquois Confederacy), from what is now New York State; also… - onion noun (an onion, onions)
A round vegetable with layers, papery brown, red or white skin and a strong smell and taste, used in cooking. - online adjective (online); adverb (online)
1) Connected to the internet or done on it: "online games". 2) As an adverb, on the internet: "We shop online." - onlooker noun (an onlooker, onlookers)
1) An onlooker is a person who watches something happen but does not take part, especially an accident, fight or event in the street. - only adverb (only); adjective (only); conjunction (only — informal: but)
1) Only means no more than, or just one. «Only 3 are left» means just 3 are left. 2) Only means nothing or nobody else: «Only Sam knew».… - onomatopoeia noun (onomatopoeia, uncountable; also an onomatopoeia — an example)
Onomatopoeia is when a word sounds like the noise it describes, such as buzz, bang, sizzle, hiss, splash, cuckoo and woof. - onondaga noun (Onondaga, the Onondaga); adjective (Onondaga) (a name)
A Native American people of central New York State, one of the Six Nations of the Haudenosaunee (Iroquois Confederacy); also their language. - onset noun (the onset, onsets)
The onset of something is its start, especially of something bad or unpleasant. - onshore adjective (onshore); adverb (onshore)
On the land, not at sea, as in "onshore wind farms". - onside adjective (onside); adverb (onside)
In football, rugby and hockey, onside means in a position where you are allowed to play the ball; it is the opposite of offside. - onslaught noun (onslaughts)
1) An onslaught is a fierce, sudden attack, when many people or things rush at once. - onward adverb (onward, onwards); adjective (onward)
1) Onward means forward, going further on. 2) Onward means from a time and later: «from Monday onward». 3) An onward journey is the next… - ooh interjection (ooh)
Ooh is a sound people make to show surprise, delight, interest or admiration. - oolong noun (oolong — uncountable; an oolong, oolongs)
1) A kind of Chinese tea, partly oxidised, between green tea and black tea in taste and colour. - ooze verb (ooze, oozes, oozed, oozing); noun (ooze — uncountable)
verb (of a thick liquid) To flow out slowly: «Honey oozed from the jar». - oozing verb form (ooze, oozes, oozed, oozing); adjective (oozing)
Oozing means slowly flowing or leaking out of something, like thick liquid. - opal noun (an opal, opals; opal as a material)
An opal is a precious stone that shows flashing rainbow colours when you move it in the light. - opaque adjective (opaque, more opaque, most opaque)
Opaque means light cannot pass through it, so you cannot see through it, like wood or a brick wall. - open verb (open, opens, opened, opening); adjective (open); noun in «in the open»
To open is to move something so you can go in or see inside: open a door, open a box. - opener noun (an opener, openers)
An opener is a tool for opening something, such as a tin opener, can opener or bottle opener. - opening noun (an opening, openings); verb form (open, opens, opened, opening); adjective (the opening scene)
An opening is a gap or hole that something can pass through. - openly adverb
1) Openly means in a way that everyone can see or hear, not secretly. 2) Openly means honestly, without hiding your feelings or thoughts. - opera noun (an opera, operas); noun (opera house, opera singer)
An opera is a play in which the actors sing almost all the words, with an orchestra playing music. - operate verb (operate, operates, operated, operating)
To operate a machine is to make it work or control it. - operatic adjective (operatic; more operatic)
To do with opera, plays where all or most of the words are sung, with an orchestra. - operating verb (present participle of operate: operate, operates, operated, operating); adjective (operating, as in operating room, operating system)
Working or running, said of a machine or business. - operation noun (operation, operations)
In maths, an operation is a way of working with numbers: add, subtract, multiply or divide. - operative adjective; noun (an operative, operatives)
Working, in action: «The new system is now operative.». - operator noun (an operator, operators)
A person who works a machine or equipment: «a crane operator». - opinion noun (an opinion, opinions)
An opinion is what you think or believe about something; it may not be the same as what others think. - opium noun (opium — uncountable)
A strong, illegal drug made from the juice of a kind of poppy, which makes people sleepy and is very addictive and dangerous. - opossum noun (an opossum, opossums); informal: possum
1) An opossum is a North and South American marsupial about the size of a cat, with a pointed white face, bare ears and a long, bare tail… - opponent noun (an opponent, opponents)
1) A person or team that you play, compete or fight against. 2) A person who disagrees with an idea or plan and argues against it. - opportunity noun (an opportunity, opportunities)
An opportunity is a time or situation when it is possible to do something you want or need to do; a chance. - opposable adjective
1) Able to be placed opposite and pressed against the other fingers, like a human thumb, so that the hand can grip and pick things up. - oppose verb (oppose, opposes, opposed, opposing)
To oppose something is to be against it and try to stop it. - opposed adjective (opposed); verb past form (oppose → opposed)
If you are opposed to something, you are against it. - opposing adjective (opposing); verb form (oppose, opposes, opposed, opposing)
Being against someone or something in a game, fight or argument (the opposing team). - opposite noun (opposite, opposites); adjective (opposite); preposition and adverb (opposite)
The opposite is the thing that is as different as can be: up is the opposite of down. - opposition noun (opposition — uncountable; the Opposition)
Opposition is strong disagreement with a plan or idea, often shown by speaking or acting against it. - oppress verb (oppresses, oppressed, oppressing)
1) To oppress people is to treat them cruelly and unfairly, keeping them under hard control. - oppressed adjective (oppressed); verb form (past tense and past participle of oppress: oppress, oppresses, oppressed, oppressing); noun (the oppressed)
Treated in a cruel and unfair way by people with power, and not given freedom or rights. - oppression noun (no plural)
1) Oppression is cruel and unfair treatment of people, keeping them down and taking away their freedom. - oppressive adjective (oppressive, more oppressive, most oppressive)
Cruel and unfair, keeping people down and taking away their freedom: an oppressive ruler. - optic adjective (optic); noun (an optic, optics)
To do with the eye or sight: «the optic nerve». - optical adjective (optical); adverb (optically)
1) To do with seeing and the eyes. 2) To do with light and how it travels, or with instruments that use light, such as lenses, microscopes… - optician noun (an optician, opticians)
An optician is a person whose job is to test people's eyes and make or sell glasses and contact lenses. - optimistic adjective (optimistic, more optimistic, most optimistic)
1) Hopeful and believing good things will happen. 2) (of a guess or plan) Hoping for more than is likely (an optimistic estimate). - option noun (an option, options); verb (option, options, optioned, optioning — rare, business use)
1) One of the things you can choose from. 2) The freedom or right to choose. 3) A school subject you choose to study (UK). 4) (formal… - optional adjective (optional)
1) Something you can choose to do or have, but you do not have to. - optometrist noun (an optometrist, optometrists)
1) An optometrist is a person trained to test people's eyesight, check eye health and prescribe glasses or contact lenses. - or conjunction
Or gives a choice between two or more things: tea or juice? - oracle noun (an oracle, oracles)
1) In ancient Greece and Rome, a priest or priestess through whom people believed the gods gave advice or told the future, or the holy… - oracular adjective
1) Oracular means like an oracle: giving wise-sounding answers or predictions that are often hard to understand. - oral adjective (oral); noun (an oral, orals — an oral exam, UK)
Oral means spoken, not written: an oral test or an oral report is done by talking. - orally adverb (orally)
1) By speaking, not in writing, as in "answer orally". 2) (medicine) By mouth, as in "take this medicine orally".
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