O
(58 words)
obese
adjective
extremely fat in a way that is dangerous for health:
obesity
noun [ U ]
the fact of being extremely fat, in a way that is dangerous for health:
object
noun
[ C usually singular ] a reason for doing something, or the result you wish to achieve by doing it:
objectively
adverb
in a way that is based on facts and not influenced by personal beliefs or feelings:
obligatory
adjective
If something is obligatory, you must do it because of a rule or law, etc.:
oblige
verb
[ I or T ] to please or help someone, especially by doing something they have asked you to do:
observation
noun
[ C ] formal a remark about something that you have noticed:
observe
verb [ T ]
formal to notice or see:
obsolete
adjective
not in use any more, having been replaced by something newer and better or more fashionable:
obstacle
noun [ C ]
something that blocks you so that movement, going forward, or action is prevented or made more difficult:
occasional
adjective
not happening or done often or regularly:
occupation
noun
[ C ] a regular activity or hobby:
occupy
verb [ T ]
(of an army or group of people) to move into and take control and/or possession of a place:
occurrence
HAPPENING
noun
[ C ] something that happens:
EXISTING
[ U ] the fact of something existing, or how much of it exists:
odds
noun [ plural ]
the probability (= how likely it is) that a particular thing will or will not happen:
of
preposition
about; relating to:
off the record
If someone says something off the record, they do not want it to be publicly reported:
office
noun
[ C or U ] a position of authority and responsibility in a government or other organization:
officially
adverb
formally and in a way agreed to or arranged by people in positions of authority:
the old days
times in the past:
omit
verb [ T ]
to fail to include or do something:
all at once
suddenly and unexpectedly:
one
formal any person, but not a particular person:
oneself
pronoun formal
the reflexive form of the pronoun ‘one’ when it refers to people in general or to the person speaking:
open
adjective
[ after verb ] available; not limited:
opening
adjective [ before noun ]
happening at the beginning of an event or activity:
openly
adverb
without hiding any of your thoughts or feelings:
open-minded
adjective
willing to consider ideas and opinions that are new or different to your own:
operation
noun
[ U ] the fact of operating or being active:
[ C ] a business organization:
[ C ] an activity that is planned to achieve something:
be opposed to sth
to disagree with a principle or plan:
opposition
noun
[ U ] strong disagreement:
the opposition
[ S, + sing/pl verb ]
the team or person being played against in a sports competition:
opt
verb [ I ]
to make a choice, especially of one thing or possibility instead of others:
optimist
noun [ C ]
someone who always believes that good things will happen:
have no option (but to do something)
to have to do a particular thing because there is no possibility of doing anything else:
organ
noun
[ C ] a part of the body of an animal or plant that performs a particular job:
organization
noun
[ U ] the way in which something is done or arranged
origin
noun
[ U ] where a person was born:
other than
different from or except:
or other
informal
used when you cannot or do not want to be exact about the information you are giving:
out
adverb, preposition
informal not accurate:
outcome
noun [ C usually singular ]
a result or effect of an action, situation, etc.:
outlook
noun
[ S ] the likely future situation:
outnumber
verb [ T ]
to be greater in number than someone or something:
outside
adjective, adverb, preposition
[ before noun ] coming from another place or organization:
outweigh
verb [ T ]
to be greater or more important than something else:
overcrowded
adjective
containing too many people or things:
overdo
verb [ T ]
to do something in a way that is too extreme:
overdraft
noun [ C ]
an amount of money that a customer with a bank account is temporarily allowed to owe to the bank, or the agreement that allows this:
overdrawn
adjective
having taken more money out of your bank account than the account contained, or (of a bank account) having had more money taken from it than was originally in it:
overestimate
verb [ I or T ]
to think that something is or will be greater, more extreme, or more important than it really is:
overtake
verb
[ T ] to go past something by being a greater amount or degree:
overview
noun [ C ]
a short description of something that provides general information about it, but no details:
overwhelm
verb
[ T usually passive ] to cause someone to feel sudden strong emotion:
overwhelming
adjective
difficult to fight against:
very great or very large:
overworked
adjective
having to work too much:
ownership
noun [ U ]
the fact that you own something:
ozone
noun [ U ]
a poisonous form of oxygen