English words: O

453 words under O; 1–100 on this page.

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• oaf noun (oafs)
  A clumsy or stupid person who is awkward and slow.
• oak noun (oak, oaks; also oak tree); adjective (made of oak)everyday · Jewish tradition
  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)everyday · Jewish tradition
  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)
  A kind of cereal plant grown for its grain.
• oath noun (an oath, oaths)everyday · Jewish tradition
  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 an…
• 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)everyday · Jewish tradition
  Doing what you are told by someone in charge, or following rules and laws.
• obedient adjective (obedient; more obedient)everyday · Jewish tradition
  Doing what you are told by a parent, teacher, rule or owner.
• obeisance noun (obeisances)everyday · Jewish tradition
  A low bow or other sign of respect to someone important.
• oberon noun (Oberon) (a name)
  The king of the fairies in old European folklore and stories.
• 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)everyday · Jewish tradition
  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…everyday · Jewish tradition
  An object (OB-ject) is a thing you can see and touch that is not alive.
• objection noun (an objection, objections)everyday · Jewish tradition
  An objection is a reason you give for not agreeing with something or not liking a plan.
• objectionable adjective (objectionable; more objectionable)
  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).
• oblation nounJewish tradition
  A gift or offering made to God, often of grain or food, brought to the altar.
• 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)
  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…
  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…everyday · Jewish tradition
  Oblique means slanting, not straight up and not flat; at an angle.
• obliterated verb form…
  Destroyed completely so that nothing is left.
• oblivion noun (oblivion — uncountable)
  The state of being completely forgotten: the old song fell into oblivion.
• oboe noun (oboe, oboes)
  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)
  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…everyday · Jewish tradition
  Not well known (an obscure singer, an obscure village).
• obscurity noun (obscurities)everyday · Jewish tradition
  The state of being hidden, unknown or unclear.
• observable adjective (observable)
  Observable means able to be seen or noticed.
• 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)everyday · Jewish tradition
  To observe is to watch something carefully to learn about it.
• observed verb…everyday · Jewish tradition
  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…
  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)everyday · Jewish tradition
  Something in your way that stops you or makes it hard to go forward.
• 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)everyday · Jewish tradition
  Stubborn; refusing to change your mind or to do as you are told.
• obstinately adverb (obstinately)Jewish tradition
  In a stubborn way, refusing to change or give way.
• 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)everyday · Jewish tradition
  To get something, especially by effort or by asking.
• 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)
  To remove a need or a problem, so that something is no longer necessary, as in "This obviates the need for…".
• obviating verb form…
  Removing a need or problem, so that something is no longer necessary.
• obvious adjective (obvious, more obvious, most obvious)everyday · Jewish tradition
  Easy to see, notice or understand; clear to everyone.
• obviously adverb (obviously)everyday · Jewish tradition
  In a way that is easy to see or understand; clearly.
• occasion noun (an occasion, occasions); verb…everyday · Jewish tradition
  A particular time when something happens (on this occasion).
• occasional adjective (occasional)
  Occasional means happening sometimes, but not often or regularly.
• occasionally adverb (occasionally)
  Occasionally means sometimes, but not often or regularly.
• occasions noun, plural of occasion (an occasion, occasions); verb…everyday · Jewish tradition
  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.
• occult adjectiveJewish tradition
  Hidden, secret, or magical, and known only to a few.
• occultism nounJewish tradition
  Belief in or study of hidden or magical powers.
• occultist nounJewish tradition
  A person who studies or practices hidden or magical arts.
• 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)everyday · Jewish tradition
  An occupation is a job or the kind of work a person does.
• occupational adjective (occupational)
  To do with a person's job or work.
• occupied verb…everyday · Jewish tradition
  Being used by someone, not free (the toilet is occupied, an occupied seat).
• occupy verb (occupy, occupies, occupied, occupying)everyday · Jewish tradition
  To live in or use a building, room or space.
• occur verb (occur, occurs, occurred, occurring)everyday · Jewish tradition
  To happen, especially without being planned.
• occurrence noun (an occurrence, occurrences)everyday · Jewish tradition
  Something that happens; an event.
• ocean noun (an ocean, oceans)
  The huge body of salt water that covers most of the Earth.
• oceanic adjective (oceanic)
  To do with the ocean or living in the ocean.
• 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
  Oct.
• october noun (October)
  October is the tenth month of the year.
• octopod noun (an octopod, octopods); adjective (octopod)
  An animal with eight arms or legs, especially an octopus.
• octopus noun (an octopus, octopuses / octopi)
  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
  A person who behaves in a strange or unusual way.
• oddity noun (an oddity, oddities)
  A strange or unusual person, thing or event.
• oddly adverb (oddly)
  Oddly means in a strange or unusual way.
• ode noun (an ode, odes)
  A poem that praises or speaks to someone or something, often in a grand, serious style.
• odious adjectiveeveryday · Jewish tradition
  Odious means very unpleasant, hateful, so that people cannot bear it.
• odor noun (odor, odors; British spelling «odour»)
  An odor is a smell, especially a strong or pleasant one.
• odorous adjective
  Odorous means having a smell, usually a pleasant or strong one.
• odour noun (an odour, odours) — UK, Canada, Australia, New…everyday · Jewish tradition
  An odour is a smell, often an unpleasant one: "a strange odour came from the bin".
• odourless adjective (odourless; US odorless)
  Odourless means having no smell at all.
• 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)
  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'»…everyday · Jewish tradition
  Of links a part to the whole it belongs to: a piece of cake, 3 of the apples.
• off preposition, adverb; adjective…everyday · Jewish tradition
  Off means away from a surface or from a place: take it off the table.
• offence noun (an offence, offences)everyday · Jewish tradition
  An offence is a crime or an act that breaks a law or rule.
• offend verb (offend, offends, offended, offending)everyday · Jewish tradition
  To make someone upset, hurt or annoyed by what you say or do.
• offended verb, past of offend; adjective (feel offended)everyday · Jewish tradition
  Feeling hurt, upset or insulted by what someone said or did.
• offender noun (an offender, offenders)everyday · Jewish tradition
  A person who has broken the law or done a crime.
• offending adjective (offending); verb form…
  Offending means upsetting someone or making them feel hurt or insulted.

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