duple

Adjective

du=ple

WORDNET DICTIONARY

duple(s = adj.all) double, dual - 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"

duple, adj. of two parts.

Idiom

duple ratio Math. a ratio of 2 to 1. duple time Mus. that with two beats to the bar.

Etymology

L duplus f. duo two

For further exploring for "duple" in Webster Dictionary Online