| opera1 |
a dramatic work set to music, with an accompaniment by an orchestra. [3 definitions] |
| operate |
to function in a correct or effective manner, as a machine. [5 definitions] |
| operation |
the act or process of operating or functioning. [5 definitions] |
| operator |
one who controls functions, operations, or activities, as of machines or businesses. [4 definitions] |
| operetta |
a short light, usu. humorous opera, often with dialogue that is spoken as well as sung. |
| ophthalmologist |
a doctor who specializes in the study and treatment of eye diseases. |
| ophthalmology |
the medical study of the eye, its diseases, and their treatments. |
| opinion |
what one thinks about a matter, esp. a judgment not necessarily based on fact alone. [5 definitions] |
| opossum |
any of a number of American marsupials that are active at night and live in trees. [2 definitions] |
| opponent |
one who opposes; antagonist; foe. |
| opportunity |
a chance that makes something possible or that may bring about some benefit. [2 definitions] |
| oppose |
to think, act, or be against; resist or obstruct. [3 definitions] |
| opposed |
not in favor of; against. |
| opposite |
located at or on the sides opposing each other; facing. [7 definitions] |
| opposition |
the act or state of opposing, or the state of being opposed. [3 definitions] |
| oppress |
to treat harshly, brutally, or unfairly. [2 definitions] |
| opt |
to decide; choose (usu. fol. by "for" or an infinitive). |
| optical |
of or concerning the sense of sight or the eye. [5 definitions] |
| optician |
a person who sells or manufactures eyeglasses, contact lenses, or other optical devices. . |
| optimism |
the belief that everything will turn out well, or that there are good aspects of every situation. (Cf. pessimism.) [3 definitions] |
| optimistic |
expecting or tending to expect favorable outcomes. [2 definitions] |