O

1 obey -v.  to act as one is ordered to act

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

3 observe -v.  to watch; to look at carefully; to celebrate orhonor something (“They will observe the anniversary of the day she was born.”)

4 occupy -v.  to take and hold or to control by force

5 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

6 of -prep. made from; belonging to; about; connected to; included among

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

8 offensive -n.  a military campaign of attack; -adj.  having to do with attacking

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

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

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

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

13 often --adv.  many times

14 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

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

16 on -prep. 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.”)

17 once --adv.  one time only

18 only --adj.  being the single one or ones; no more than (“We have only two dollars.”)

19 open -v.  to start (“They opened talks.”); -adj.  not closed; not secret

20 operate -v.  to do work or a job; to cut into the body for medical reasons

21 opinion -n.  a belief based on one’s own ideas and thinking

22 oppose -v.  to be against; to fight against

23 opposite --adj.  different as possible; completely different from; exactly the other way (“North is the opposite direction from south.”)

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

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

26 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

27 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

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

29 organism -n.  a living thing, often so small it can be seen only through a microscope

30 organize -v.  to put in order; to put together into a system

31 other --adj.  different; of another kind; the remaining one or ones of two or more (“That man is short; the other is tall.”)

32 our --adj.  of or belonging to us

33 oust -v.  to force to leave; to remove by force

34 out --adv.  away from the inside; opposite of in

35 over – -conj.  above; covering; across, in or on every part of (“all over the world”)

36 overthrow -v.  to remove from power; to  defeat or end by force

37 owe -v.  to pay or have to repay (usually money) in return for something received

38 own -v.  to have or possess for oneself

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