D defs.my
Entry 1 sense Webster, 1913

Time signature

· IPA
01 A sign at the beginning of a composition or movement, placed after the key signature, to indicate its time or meter. Also called rhythmical…
  1. 1.
    A sign at the beginning of a composition or movement, placed after the key signature, to indicate its time or meter. Also called rhythmical signature. It is in the form of a fraction, of which the denominator indicates the kind of note taken as time unit for the beat, and the numerator, the number of these to the measure.(Music) Also: rhythmical signature