Simple Definition of time signature
: a number that is written at the beginning of a piece of music and that shows the number and length of the beats in each measure
Full Definition of time signature
: a sign used in music to indicate meter and usually written as a fraction with the bottom number indicating the kind of note used as a unit of time and the top number indicating the number of units in each measure
First Known Use of time signature
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Britannica.com: Encyclopedia article about "time signature"
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