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English Dictionary — Definitions & Meanings

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“O” Words

occupied
adj
Currently in use or taken, such as a seat, room, or toilet.
occupier
noun
A person or power that occupies a place, especially a foreign country controlling someone else's land.
occupy
verb
To live in, use, or take up a space.
occur
verb
To happen or take place.
occurred
verb
Past tense and past participle of occur: happened or took place, usually without being planned.
occurrence
noun
Something that happens; an event or instance.
occurrent
adj
Happening now; actually taking place at present.
occurring
adj
Happening, especially in a specified way or place.
OCD
adj
Showing obsessive, perfectionistic tendencies, often used loosely to describe someone who likes things a certain way (informally referencing obsessive-compulsive disorder).
ocean
noun
One of the huge bodies of salt water that cover most of the Earth's surface.
oceanarium
noun
A large aquarium-style park where people go to see sea creatures such as dolphins or fish.
oceanic
adj
Relating to, found in, or resembling the ocean.
oceanographer
noun
A person who studies oceanography, the science of the oceans.
oceanography
noun
The scientific study of the oceans and the ocean floor.
ocellated
adj
Marked with small, eye-like spots.
ocelot
noun
A spotted wild cat of the Americas, with blackish spots and blotches on its coat.
och
intj
A Scottish and Irish exclamation used to show agreement, mild annoyance, or resignation.
Ochoa
name
A Spanish surname of Basque origin, meaning "wolf."
ochre
noun
An earthy clay pigment made up of silica, aluminium and ferric oxide.
ock
noun
A slang, and now dated, New York term for a Middle Eastern deli or bodega owner.
oct
name
Alternative letter-case form of Oct (“October”).
octad
noun
A set of eight things.
octadecagon
noun
An octadecagon is a polygon with eighteen sides and eighteen corners.
octagon
noun
A shape with eight straight sides and eight angles.
octahedron
noun
A solid shape with eight flat faces.
octane
noun
Any of a group of hydrocarbon compounds found in petroleum and used as fuels and solvents.
octangular
adj
Having eight angles; eight-sided.
octant
noun
One eighth of a circle, equal to an angle of 45 degrees.
octathlon
noun
A sporting competition made up of eight separate events.
octave
noun
The musical distance between one note and another note with double or half its pitch frequency, spanning eight notes of the scale.
Octavia
name
A feminine given name of Latin origin, from the Roman family name Octavius, meaning "eighth."
Octavian
name
A masculine given name of Latin origin, historically borne by Augustus Caesar before he took the name Augustus.
Octavius
name
A masculine given name of Latin origin, meaning "eighth," from a prominent Roman family name.
octavo
noun
A sheet of paper of a specific size, folded three times from a larger sheet to give eight leaves.
octet
noun
A group of eight of something.
October
name
The tenth month of the year, between September and November, associated in the northern hemisphere with autumn and falling leaves.
octoberfest
name
The Bavarian festival called Oktoberfest, or Wiesn, or any similar festival, held between late September and early October, usually featuring German music, food, and beer-drinking among its prominent activities.
octocentenary
noun
The eight-hundredth anniversary of an event.
octocentennial
adj
Relating to an eight-hundredth anniversary.
octonary
adj
Coming eighth in order or rank.
octopus
noun
A soft-bodied sea creature with eight arms lined with suckers and no internal shell.
ocular
adj
Relating to the eye or to eyesight.
oculist
noun
A doctor who treats problems with the eyes.
od
verb
To take a dangerous excess of a drug; to overdose.
oda
noun
A private room set aside for women within a harem.
odal
noun
Land that could be passed down within a family, held under an old system used by early Scandinavian and other Germanic peoples.
odalisque
noun
A woman kept as a slave in a harem, especially in the palace of an Ottoman ruler.
odawa
name
The name of the Ottawa people.
odd
adj
Strange, unusual, or not what you would expect.
oddball
noun
A person who behaves in a strange or eccentric way.
oddity
noun
A strange or unusual thing, person, or detail.
oddly
adv
In a strange or unexpected way.
oddness
noun
How strange or unusual something is.
odds
noun
The likelihood of something happening, especially as expressed in betting.
ode
noun
A poem, often meant to be sung, that expresses strong feeling or praise for its subject.
Odell
name
A given name and surname, also the name of a village in England and several small towns in the United States.
Oder
name
A river running through central Europe, forming part of the border between Germany and Poland before reaching the Baltic Sea.
Odessa
name
A major port city in Ukraine on the Black Sea coast.
Odia
noun
The Indo-Aryan language spoken by around 40 million people, mainly in the eastern Indian state of Odisha, where it is the official language. It is written in its own rounded script and is one of India's classical languages.
Odie
name
A diminutive of several given names such as Odell, Odin, or Otis, also used as a formal given name and surname.
Odin
name
In Norse mythology, the chief god, associated with wisdom, war, and poetry.
odious
adj
Deeply unpleasant; causing strong dislike or disgust.
odium
noun
Strong dislike or hatred felt towards someone or something.
Odo
name
A masculine given name of historical usage, derived from Latin Otho.
odontiasis
noun
The process of a person's teeth coming through, also called teething.
odontology
noun
The scientific study of how teeth are formed and how they develop.
odor
noun
A smell, whether pleasant or unpleasant.
odorless
adj
Having no smell at all.
odorous
adj
Possessing a distinctive smell.
odour
noun
A smell, whether pleasant or unpleasant — the standard British spelling of "odor".
ods
intj
An old-fashioned mild oath, a euphemistic shortening of "God's" used in exclamations like "Ods bodkins!"
odum
noun
Another name for the iroko tree, a large West African hardwood tree valued for its durable timber.
Odysseus
name
A legendary Greek king and hero known for his cunning, famous for devising the Trojan Horse and for his long journey home after the Trojan War.
odyssey
noun
A long, eventful journey, especially one full of challenges.
odzookens
intj
An old-fashioned exclamation used to show surprise or shock.
OE
noun
A small island, especially in Scandinavian place names.
OED
noun
The Oxford English Dictionary, the largest historical dictionary of the English language, which records the meaning, spelling and recorded history of words with dated quotations showing how each sense has been used over time.
Oedipus
name
A figure from Greek mythology who unknowingly killed his father and married his mother, later the subject of Sophocles's tragedies.
oei
name
A surname found mainly in Indonesia.
oesophagus
noun
The tube in the body that food travels through from the throat down to the stomach.
oestrogen
noun
Any of a group of steroid hormones produced by the ovaries that act as female sex hormones.
oestrus
noun
A type of fly that bites, also known as a botfly.
of
prep
Used to show that something belongs to, or is a part of, something else.
ofc
phrase
Of course: used in messaging as shorthand for agreement or for something taken as obvious.
off
adv
Away from a place, position, or reference point.
off-peak
adjective
Happening at, or applying to, a time when demand is low — so usually quieter and cheaper. It is used most often of travel tickets, electricity tariffs, phone calls and gym or venue bookings.
offal
noun
The internal organs of a butchered animal, such as liver or kidney, eaten as food.
offbeat
noun
(music) The beats in a bar of music that do not usually get the emphasis.
offboard
verb
To get off a vehicle, especially a bus, train, or plane.
offcut
noun
A small piece left over, and not needed, after a larger piece has been cut.
offence
noun
British spelling of "offense" — a crime or breach of the law, or a feeling of being hurt or insulted.
offend
verb
To hurt someone's feelings or upset them, often unintentionally.
offender
noun
A person who commits a crime or breaks the law.
offending
adj
Guilty of a wrongdoing; the one responsible for a problem.
offense
noun
A wrongdoing, crime, or breach of a rule.
offenseless
adj
Not causing any harm or offence.
offensive
adj
Causing anger, disgust, or hurt feelings.
offer
verb
To present something for someone to accept or refuse.
offering
noun
Something given, presented, or put up for consideration, especially as a gift, contribution, or for sale.
offertory
noun
A prayer sung or spoken while bread and wine are set on the altar during a Roman Catholic or Anglican church service.
offhand
adj
Said or done without preparation or careful thought.
offhandedly
adv
In a casual, careless way, without much thought or preparation.
office
noun
A room or building where people do administrative or professional work.
officeholder
noun
Someone who holds a position, especially one they were elected or appointed to in government.
officer
noun
Someone holding a position of authority, especially in the military, police, or government.
official
adj
Approved by, or coming from, a proper authority.
officialdom
noun
Officials as a group, especially those who work in government or the civil service.
officially
adv
According to official rules, procedures, or authority.
officiate
verb
To perform the official duties of a position, especially presiding over a ceremony.
offing
noun
The near future, especially something expected soon. Chiefly used in the phrase "in the offing".
offline
adj
Not connected to a network, especially the internet.
offload
verb
To remove a load or cargo from a vehicle.
offloading
noun
The act of unloading or getting rid of something.
offscouring
noun
Waste or dirt scrubbed off something.
offscreen
adj
Happening outside the visible frame of a film or television screen.
offset
noun
Something that balances out or compensates for something else.
offsetting
noun
The use of one thing to offset another; the practice of compensating for or counterbalancing one thing or amount by another contrary thing or amount
offshoot
noun
A new shoot or branch growing out from the main stem of a plant.
offshore
adj
Located in the sea some distance from the coast.
offside
adj
In an illegal position ahead of the ball or play, according to the rules of a sport such as soccer or hockey.
offsite
adj
Away from the main site, or somewhere that does not belong to a particular organisation.
offspring
noun
A person's child, or an animal's or plant's young.
offstage
adj
Happening in the part of a theater not visible to the audience.
offstand
verb
To resist or hold out against something.
oft
adv
Often; frequently. Now mostly literary or used in compound words.
often
adv
Frequently; many times.
oftentimes
adv
Often; frequently. A slightly old-fashioned or formal variant of "often".
oftest
adv
Most often (superlative form of oft: most oft)
ofttimes
adv
(archaic) Often, or many times.
OG
adj
Original, authentic, or old-school; the real or first version of something.
Ogata
name
A Japanese surname.
Ogawa
name
A Japanese surname, literally "small river."
Ogden
name
An English habitational surname and given name, and the name of a city in Utah and several other places in the United States and Canada.
ogdoad
noun
A group or set of eight things.
ogle
verb
To stare at someone or something in an obvious, often lustful or admiring way.
ogling
noun
The act of staring at someone in an obvious, often lustful way.
ogre
noun
A large, ugly, monstrous creature in folklore, known for its brutish strength and appetite for humans.
ogress
noun
A woman who is an ogre, a cruel giant from folk tales.
OH
intj
Used to express surprise, realization, understanding, or emotion.
ohana
noun
Family in the Hawaiian sense: not only blood relatives but everyone bound to you by loyalty and care, none of whom is left behind.
ohm
noun
The standard unit of electrical resistance.
Ohm's law
noun
The rule that the current through a conductor is proportional to the voltage across it and inversely proportional to its resistance, written V = IR: voltage equals current times resistance.
ohmigod
intj
An eye dialect spelling of oh my God.
oho
intj
Used to express surprise or a triumphant realization, similar to "aha".
OHS
noun
Occupational health and safety: the field concerned with keeping workers free from injury and illness at work, covering hazard assessment, safe systems of work, protective equipment and legal duties on employers.
oi
intj
Used to get someone's attention, often sharply, or to express annoyance or surprise.
oil
noun
A thick, greasy liquid, either from plants, animals, or petroleum, used for cooking, fuel, or lubrication.
oiled
adj
Coated or treated with oil.
oiler
noun
A person or thing that applies oil, especially to machinery.
oilfish
noun
A large fish, also called the snake mackerel, whose flesh contains waxy oils rather than ordinary fats.