Definition of twin

• a. - Being one of two born at a birth; as, a twin brother or sister.
• a. - Being one of a pair much resembling one another; standing the relation of a twin to something else; -- often followed by to or with.
• a. - Double; consisting of two similar and corresponding parts.
• a. - Composed of parts united according to some definite law of twinning. See Twin, n., 4.
• n. - One of two produced at a birth, especially by an animal that ordinarily brings forth but one at a birth; -- used chiefly in the plural, and applied to the young of beasts as well as to human young.
• n. - A sign and constellation of the zodiac; Gemini. See Gemini.
• n. - A person or thing that closely resembles another.
• n. - A compound crystal composed of two or more crystals, or parts of crystals, in reversed position with reference to each other.
• v. i. - To bring forth twins.
• v. i. - To be born at the same birth.
• v. t. - To cause to be twins, or like twins in any way.
• v. t. - To separate into two parts; to part; to divide; hence, to remove; also, to strip; to rob.
• v. i. - To depart from a place or thing.