O
- oaf noun (oafs)
A clumsy or stupid person who is awkward and slow. - oak noun (oak, oaks; also oak tree); adjective (made of oak)
An oak is a big tree with hard wood that can live for hundreds of years. - oaken adjective (oaken)
Made of oak wood. - oar noun (an oar, oars)
An oar is a long pole with a flat blade at one end, used to row a boat. - oas abbreviation (OAS); fragment
OAS: the Organization of American States, a group of countries in North, Central and South America that work together. - oasis noun (an oasis, oases)
A place in a desert where there is water, so plants and trees such as date palms can grow. - oat noun (oats — usually plural; oat as an adjective: oat milk)
1) A kind of cereal plant grown for its grain. 2) (oats) The grains of this plant, used to make porridge, oatcakes, flapjacks and muesli… - oath noun (an oath, oaths)
1) An oath is a serious promise, often in front of others or in a court, that you will tell the truth or do something: "the witness took… - oatmeal noun (oatmeal — uncountable); adjective (oatmeal — a colour)
Oats that have been crushed or ground, used to make porridge, oatcakes and biscuits. - obedience noun (obedience, uncountable)
Doing what you are told by someone in charge, or following rules and laws. - obedient adjective (obedient; more obedient)
1) Doing what you are told by a parent, teacher, rule or owner. 2) (of animals) Trained to follow commands, as in "an obedient dog". - obeisance noun (obeisances)
(formal, old use) A low bow or other sign of respect to someone important. - oberon noun (Oberon) (a name)
1) (a name) The king of the fairies in old European folklore and stories. 2) (science) The second-largest moon of the planet Uranus. - obesity noun (obesity — uncountable)
The condition of having much more body fat than is healthy, which can lead to illnesses such as diabetes and heart disease. - obey verb (obey, obeys, obeyed, obeying)
1) To do what a person, rule or law tells you to do. - obituary noun (an obituary, obituaries)
A piece of writing in a newspaper or website, after someone has died, telling about their life and what they did. - object noun (an object, objects); verb (object, objects, objected, objecting)
An object (OB-ject) is a thing you can see and touch that is not alive. - objection noun (an objection, objections)
An objection is a reason you give for not agreeing with something or not liking a plan. - objectionable adjective (objectionable; more objectionable)
1) (formal) Unpleasant or offensive, so that people object to it. - objective noun (an objective, objectives); adjective (objective)
An aim or goal you are trying to reach (the lesson objective). - obligation noun (an obligation, obligations)
An obligation is something you must do because a rule, a promise or your duty says so. - obligatorily adverb (obligatorily)
1) (formal) Because a rule or law says you must; in a way that is required, not a choice. - obligatory adjective (obligatory)
Obligatory means something you must do because a rule or law says so; it is not a free choice. - oblige verb (oblige, obliges, obliged, obliging)
To oblige someone means to force them to do something by law, a rule or duty. - obliged adjective (obliged); verb past form of oblige (oblige, obliges, obliged, obliging)
Obliged means having to do something because of a rule, law or duty: You are obliged to wear a seat belt. - oblique adjective (oblique; more oblique); noun (an oblique — UK, the slash sign /)
Oblique means slanting, not straight up and not flat; at an angle. - obliterated verb form (past tense and past participle of obliterate: obliterate, obliterates, obliterated, obliterating); adjective (obliterated)
1) Destroyed completely so that nothing is left. 2) Covered or hidden so that it cannot be seen, as in "footprints obliterated by snow".… - oblivion noun (oblivion — uncountable)
The state of being completely forgotten: the old song fell into oblivion. - oboe noun (oboe, oboes)
1) An oboe is a woodwind musical instrument shaped like a long thin tube, played by blowing through a double reed, which makes a clear… - oboist noun (an oboist, oboists)
1) A person who plays the oboe, a woodwind instrument with a double reed. - obscene adjective (obscene, more obscene)
Obscene means very rude and shocking, especially about sex or the body, and not acceptable in public. - obscenity noun (obscenity — uncountable; an obscenity, obscenities)
A very rude or offensive word, especially a swear word. - obscure adjective (obscure, more obscure, most obscure); verb (obscure, obscures, obscured, obscuring)
Not well known (an obscure singer, an obscure village). - obscurity noun (obscurities)
1) The state of being hidden, unknown or unclear. 2) The state of not being famous or well known. - observable adjective (observable)
1) Observable means able to be seen or noticed. 2) (science) An observable fact is one you can check by looking, measuring or testing. - observance noun (observance, observances)
Following or obeying a law, rule or custom: «observance of the rules». - observation noun (an observation, observations)
Observation is watching something carefully to learn about it. - observatory noun (an observatory, observatories)
An observatory is a building with big telescopes and instruments for watching and studying stars, planets and space. - observe verb (observe, observes, observed, observing)
To observe is to watch something carefully to learn about it. - observed verb (past and past participle of «observe»: observe, observes, observed, observing); adjective (observed)
Watched or looked at carefully, often to learn something. - observer noun (an observer, observers)
A person who watches something carefully, often to learn or to report. - obsessed adjective (obsessed; more obsessed); verb form (past tense and past participle of obsess: obsess, obsesses, obsessed, obsessing)
Thinking about something or someone all the time, so it fills your mind. - obsidian noun (obsidian; uncountable)
Obsidian is a hard, shiny black (or dark) natural glass that forms when lava from a volcano cools very quickly. - obsolete adjective (obsolete)
Obsolete means no longer used because something newer or better has replaced it. - obstacle noun (an obstacle, obstacles)
1) Something in your way that stops you or makes it hard to go forward. 2) A problem or difficulty that makes it hard to do something. - obstinacy noun (obstinacies)
The state of refusing to change your mind or give in, even when you should. - obstinate adjective (obstinate, more obstinate, most obstinate)
Stubborn; refusing to change your mind or to do as you are told. - obstruct verb (obstruct, obstructs, obstructed, obstructing)
To block a road, path, pipe or opening so things cannot pass. - obstruction noun (an obstruction, obstructions; uncountable obstruction)
An obstruction is something that blocks a road, path, pipe or passage so that things cannot get through. - obtain verb (obtain, obtains, obtained, obtaining)
1) (formal) To get something, especially by effort or by asking. 2) (formal, rare) To exist or be in use (of rules). - obtainable adjective (obtainable)
Obtainable means able to be got or bought: "the tickets are obtainable from the office". - obtuseness noun (obtuseness — uncountable)
Slowness to understand things; not noticing what is obvious. - obviate verb (obviate, obviates, obviated, obviating)
1) (formal) To remove a need or a problem, so that something is no longer necessary, as in "This obviates the need for…". - obviating verb form (present participle of obviate: obviate, obviates, obviated, obviating)
1) (formal) Removing a need or problem, so that something is no longer necessary. - obvious adjective (obvious, more obvious, most obvious)
1) Easy to see, notice or understand; clear to everyone. 2) Too easy or expected; not clever (an obvious joke). - obviously adverb (obviously)
In a way that is easy to see or understand; clearly. - occasion noun (an occasion, occasions); verb (occasion, occasioned — formal)
A particular time when something happens (on this occasion). - occasional adjective (occasional)
Occasional means happening sometimes, but not often or regularly. - occasionally adverb (occasionally)
1) Occasionally means sometimes, but not often or regularly. - occasions noun, plural of occasion (an occasion, occasions); verb (occasion, formal)
Times when something happens: «on three occasions» means three times. - occident noun (the occident; usually with «the»)
The Occident is the Western part of the world, meaning Europe and the countries settled from it. - occlusion noun (occlusion, occlusions; also uncountable)
A blocking or closing of a tube, pipe or blood vessel. - occupant noun (an occupant, occupants)
An occupant is a person who lives in a house or flat, or who is in a room, seat or car at a certain time. - occupation noun (an occupation, occupations)
An occupation is a job or the kind of work a person does. - occupational adjective (occupational)
1) To do with a person's job or work. 2) Caused by or happening because of someone's work, as in "occupational injury". - occupied verb (past of «occupy»: occupy, occupies, occupied, occupying); adjective (occupied)
Being used by someone, not free (the toilet is occupied, an occupied seat). - occupy verb (occupy, occupies, occupied, occupying)
1) To live in or use a building, room or space. 2) To fill time or keep someone busy. 3) To take control of a place by force, such as an… - occur verb (occur, occurs, occurred, occurring)
1) (formal) To happen, especially without being planned. 2) To be found or to exist somewhere. 3) occur to someone: to come into someone's… - occurrence noun (an occurrence, occurrences)
1) Something that happens; an event. 2) The fact of something happening or how often it happens (the occurrence of storms). 3) (formal)… - ocean noun (an ocean, oceans)
The huge body of salt water that covers most of the Earth. - oceanic adjective (oceanic)
1) To do with the ocean or living in the ocean. 2) Like an ocean: very big and wide. 3) (geography) To do with Oceania, the region of… - ocelot noun (an ocelot, ocelots)
An ocelot is a wild cat about twice the size of a pet cat, with spotted and striped fur, living in the forests of Central and South America. - oct abbreviation
1) Oct. — short for October, the tenth month. 2) Short for octave in music, or octal (base 8) in computing and maths. - october noun (October)
1) October is the tenth month of the year. It has 31 days and comes after September and before November. - octopod noun (an octopod, octopods); adjective (octopod)
An animal with eight arms or legs, especially an octopus. - octopus noun (an octopus, octopuses / octopi)
1) A sea animal with a soft, round body and eight long arms covered in suckers. - odd adjective (odd, odder, oddest); noun in «odds»
An odd number cannot be split into two equal whole groups, like 1, 3, 5 or 7. - oddball noun (an oddball, oddballs); adjective (oddball) — informal
1) (informal) A person who behaves in a strange or unusual way. 2) (informal, adjective) Strange or unusual: an oddball idea. - oddity noun (an oddity, oddities)
1) A strange or unusual person, thing or event. 2) Being strange or unusual (uncountable). - oddly adverb (oddly)
1) Oddly means in a strange or unusual way. 2) Oddly (enough) means surprisingly. - ode noun (an ode, odes)
A poem that praises or speaks to someone or something, often in a grand, serious style. - odious adjective
1) Odious means very unpleasant, hateful, so that people cannot bear it. 2) Odious describes a person who is spiteful and unkind. - odor noun (odor, odors; British spelling «odour»)
1) An odor is a smell, especially a strong or pleasant one. 2) An odor can be a bad smell that hangs in the air. - odorous adjective
1) Odorous means having a smell, usually a pleasant or strong one. 2) (old use) Odorous describes something sweet-smelling, like flowers. - odour noun (an odour, odours) — UK, Canada, Australia, New Zealand, Ireland spelling; odor in the USA
An odour is a smell, often an unpleasant one: "a strange odour came from the bin". - odourless adjective (odourless; US odorless)
1) Odourless means having no smell at all. 2) (science) An odourless gas or liquid cannot be noticed by your nose. - odyssey noun (an odyssey, odysseys); proper noun (the Odyssey)
A long, exciting journey full of adventures and difficulties. - oesophagus noun (the oesophagus, oesophaguses or oesophagi)
1) The oesophagus is the muscular tube that carries food and drink from your mouth and throat down to your stomach. - of preposition; casual spelling «a» or «o'» (lotta, cuppa, o'clock)
Of links a part to the whole it belongs to: a piece of cake, 3 of the apples. - off preposition, adverb; adjective (the light is off; the milk is off)
Off means away from a surface or from a place: take it off the table. - offence noun (an offence, offences)
An offence is a crime or an act that breaks a law or rule. - offend verb (offend, offends, offended, offending)
To make someone upset, hurt or annoyed by what you say or do. - offended verb, past of offend; adjective (feel offended)
1) Feeling hurt, upset or insulted by what someone said or did. 2) Past form of offend: made someone upset. 3) (formal) Broke a law. - offender noun (an offender, offenders)
A person who has broken the law or done a crime. - offending adjective (offending); verb form (-ing of offend: offend, offends, offended, offending)
Offending means upsetting someone or making them feel hurt or insulted. - offense noun (offense, offenses; British spelling «offence», offences)
An offense is a wrong that someone does, a bad action or a crime. - offensive adjective (offensive words, more offensive); noun (an offensive, offensives)
1) Rude or insulting, likely to upset people. 2) Very unpleasant to the senses: an offensive smell. 3) (sport, US) To do with attacking… - offensiveness noun (offensiveness, uncountable)
Offensiveness is the quality of being rude or hurtful, so that it upsets or insults people. - offer verb (offer, offers, offered, offering); noun (an offer, offers)
To offer is to say you will give something to someone, or to hold it out for them to take. - offering noun (an offering, offerings); verb form (offering — from offer)
An offering is something you give, especially as a gift.
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