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

　　on - prep. above and held up by; touching the upper surface of ; supported by ; about ; at the time of

　　once - ad. one time only

　　only - ad. being the single one or ones; no more than

　　open - v. to start ; 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 ones 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

　　or - conj. giving another of two choices; giving the last of several choices

　　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

　　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

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