Having two parts or consisting of two; especially in music, describing time with two beats per measure (like 2/4 time).
From Latin duplex (double). The word entered English from Old French and is related to duplicate. In music, it specifically describes rhythmic structures with two-beat groupings.
Duple time in music is so common we rarely think about it—songs like 'Twinkle Twinkle Little Star' are in duple meter, while waltzes use triple meter.
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