Consisting of two equal, identical, or similar parts or things. Having some essential part or feature twice, in particular. Lower in pitch by an octave. At or to twice the amount or extent. A thing that is twice as large as usual or is made up of two standard units or things. A person who looks exactly like another. (especially in tennis and badminton) a game or competition involving sides made up of two players. Become twice as much or as many. Fold or bend (paper, cloth, or other material) over on itself. (of a person or thing) be used in or play another, different role. Twice as much or as many. A number or amount that is twice as large as a contrasting or usual number or amount.