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opossum a small mammal with gray fur, a pointed nose, and a long tail, which it uses to hang from tree branches. The common opossum is the only marsupial that lives in North America. Several other kinds of opossums live in Central and South America. The female opossum carries her young in a pouch in her belly. [2 definitions]
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]