double

adjective 1 consisting of two equal, identical, or similar parts or things : the double doors. • having twice the usual size, quantity, or strength : she sipped a double brandy. • designed to be used by two people : a double bed. • having two different roles or interpretations, esp. in order to deceive or confuse : the furtive double life of a terrorist. 2 having some essential part or feature twice, in particular • (of a flower variety) having more than one circle of petals : large double blooms. • (of a domino) having the same number of dots on each half. • used to indicate that a letter or number occurs twice in succession : “otter” is spelled with a double t. 3 Music lower in pitch by an octave.