(1):

(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.

(2):

(a.) Double; consisting of two similar and corresponding parts.

(3):

(a.) Being one of two born at a birth; as, a twin brother or sister.

(4):

(a.) Composed of parts united according to some definite law of twinning. See Twin, n., 4.

(5):

(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.

(6):

(n.) A sign and constellation of the zodiac; Gemini. See Gemini.

(7):

(n.) A person or thing that closely resembles another.

(8):

(n.) A compound crystal composed of two or more crystals, or parts of crystals, in reversed position with reference to each other.

(9):

(v. i.) To bring forth twins.

(10):

(v. i.) To be born at the same birth.

(11):

(v. t.) To cause to be twins, or like twins in any way.

(12):

(v. t.) To separate into two parts; to part; to divide; hence, to remove; also, to strip; to rob.

(13):

(v. i.) To depart from a place or thing.