| opponent |
one who fights, plays, or takes a position against another. |
| opportunity |
a chance for a better situation. [2 definitions] |
| oppose |
to think, act, or be against; resist. [2 definitions] |
| opposed |
not in favor of; against. |
| opposite |
located at or on the sides across from each other; facing. [4 definitions] |
| opposition |
the act or state of being against, or the state of having someone against another. [3 definitions] |
| oppress |
to treat in a way that is cruel or not fair. [2 definitions] |
| opt |
to decide; choose (usually followed by "for" or an infinitive). |
| optical |
of or having to do with the sense of sight or the eye. [2 definitions] |
| optician |
a person who makes or sells eyeglasses and contact lenses. |
| optimism |
the belief that things will turn out well or that there is always hope for something good to happen. |
| optimistic |
likely to be hopeful that things will work out well. |
| option |
the right, power, or freedom to choose. [2 definitions] |
| optional |
left to someone's choice; not required. |
| optometrist |
a person who is trained to examine people's eyes and to fit them with eyeglasses or contact lenses. |
| -or1 |
See "-er1" |
| OR1 |
abbreviation of "Oregon." |
| OR2 |
abbreviation of "operating room." |
| or |
used to indicate alternatives. [5 definitions] |
| oral |
spoken, rather than written; carried out by speaking. [2 definitions] |
| orange |
a round fruit with a reddish yellow peel. It is sweet and juicy on the inside. [4 definitions] |