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Children's Dictionary
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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 an abbreviation for Oregon. [2 definitions]
or used to indicate alternatives. [3 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]
orangeade a soft drink made with orange juice or orange flavoring.