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obey v. to act as one is ordered to act
object v. to show that one does not like or approve; to protest; n. something not alive that can be seen or touched
observe v. to watch; to look at carefully; to celebrate or honor something
occupy v. to take and hold or to control by force
ocean n. 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
offensive n. a military campaign of attack; ad. having to do with attacking
offer v. to present or propose; n. the act of presenting or proposing; that which is presented or proposed
officer n. a person in the military who commands others; any person who is a member of a police force
official n. 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 ad. many times
oil n. 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 ad. not young or new; having lived or existed for many years
once ad. one time only
only ad. being the single one or ones; no more than
open v. to start (“They opened talks.”); ad. not closed; not secret
operate v. to do work or a job; to cut into the body for medical reasons
opinion n. a belief based on one’s own ideas and thinking
oppose v. to be against; to fight against
opposite ad. different as possible; completely different from; exactly the other way
oppress v. to make others suffer; to control by the use of unjust and cruel force or power
orbit v. 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 v. 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 n. a part of the body that has a special purpose, such as the heart or brain
organism n. a living thing, often so small it can be seen only through a microscope
organize v. to put in order; to put together into a system
other ad. different; of another kind; the remaining one or ones of two or more
oust v. to force to leave; to remove by force
over conj. above; covering; across, in or on every part of
overthrow v. to remove from power; to defeat or end by force
owe v. to pay or have to repay (usually money) in return for something received
own v. to have or possess for oneself
n. (noun) a name word
v. (verb) an action word
ad. (adjective/adverb) a describing word
prep. (preposition) a word used to show a relatio
pro. (pronoun) a word used in place of a noun
conj. (conjunction) a joining word

Quote:VOA Special English WordBook