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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.
orangutan a large ape that lives in the rain forests of a few south Asian islands. Orangutans have long, red-brown fur and long arms. They spend most of their time in trees. They are a kind of primate. Orangutans are endangered.
orbit the curved path in which a planet, satellite, or spacecraft moves in a circle around another body. [3 definitions]
orchard a piece of land planted with fruit or nut trees.
orchestra a group of musicians who play different kinds of instruments and perform together. [3 definitions]
orchid a plant that bears showy flowers. Most orchids are found in the tropics. [3 definitions]
ordain to admit to the clergy as a priest, minister, or rabbi in a formal ceremony. [2 definitions]
ordeal a painful, difficult experience, or test of one's character.