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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.
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.