English Vocabulary

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obey to act as one is ordered to act

object to show that one does not like or approve; to protest; n. something not alive that can be seen or touched

observe to watch; to look at carefully; to celebrate or honor something ("They will observe the anniversary of the day she was born.")

occupy to take and hold or to control by force

ocean the area of salt water that covers almost seventy-five percent of the earth's surface; any of the five main divisions of this water

of made from; belonging to; about; connected to; included among

off away; at a distance; condition when something is no longer operating or continuing; not on; not connected

offensive a military campaign of attack; ad. having to do with attacking

offer to present or propose; n. the act of presenting or proposing; that which is presented or proposed

office a room or building where business or work is done; a public position to which one is elected or appointed

officer a person in the military who commands others; any person who is a member of a police force

official a person with power in an organization; a representative of an organization or government; ad. of or about an office; approved by the government or someone in power

often many times

oil a thick liquid that does not mix with water and that burns easily; a black liquid taken from the ground and used as fuel

old not young or new; having lived or existed for many years

on above and held up by; touching the upper surface of ("The book is on the table."); supported by ("He is on his feet."); about ("The report on the meeting is ready."); at the time of ("He left on Wednesday.")

once one time only

only being the single one or ones; no more than ("We have only two dollars.")

open to start ("They opened talks."); ad. not closed; not secret

operate to do work or a job; to cut into the body for medical reasons

opinion a belief based on one's own ideas and thinking

oppose to be against; to fight against

opposite different as possible; completely different from; exactly the other way ("North is the opposite direction from south.")

oppress to make others suffer; to control by the use of unjust and cruel force or power

or giving another of two choices; giving the last of several choices

orbit to travel in space around a planet or other object; n. the path or way an object travels in space around another object or planet

order to give a command; to tell someone what to do; n. a command; the correct or normal way things are organized; a peaceful situation in which people obey laws

organ a part of the body that has a special purpose, such as the heart or brain

organism a living thing, often so small it can be seen only through a microscope

organize to put in order; to put together into a system

other different; of another kind; the remaining one or ones of two or more ("That man is short; the other is tall.")

our of or belonging to us

oust to force to leave; to remove by force

out away from the inside; opposite of in

over above; covering; across, in or on every part of ("all over the world")

overthrow to remove from power; to defeat or end by force

owe to pay or have to repay (usually money) in return for something received

own to have or possess for oneself

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