Having two parts

• Having two beats to the measure
• Twofold
• Involving two parts
• Double line crossed by Patsy
• Having two beats per measure, in music
• Of two
• Consisting of two

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Duple \Du"ple\, a. [L. duplus. See Double .] Double. Duple ratio (Math.), that in which the antecedent term is double the consequent, as of 2 to 1, 8 to 4, etc. [1913 Webster] ||

Wiktionary Word definitions in Wiktionary
a. 1 (context rare English) double. 2 (context of time or music English) Having two beats, or a multiple of two beats, in each measure. 3 (context poetry English) Having two beats in each foot.