dual
adj 1: consisting of or involving two parts or components usually
in pairs; "an egg with a double yolk"; "a double
(binary) star"; "double doors"; "dual controls for
pilot and copilot"; "duple (or double) time consists
of two (or a multiple of two) beats to a measure"
[syn: {double}, {duple}]
2: having more than one decidedly dissimilar aspects or
qualities; "a double (or dual) role for an actor"; "the
office of a clergyman is twofold; public preaching and
private influence"- R.W.Emerson; "every episode has its
double and treble meaning"-Frederick Harrison [syn: {double},
{twofold}, {treble}, {threefold}]
3: a grammatical number category referring to two items or
units (as opposed to one item (singular) or more than one
item (plural)); "ancient Greek had the dual form but it
has merged with the plural form in modern Greek"