From Longman Dictionary of Contemporary Englishtime signatureˈtime ˌsignature noun [countable] APMtwo numbers at the beginning of a line of music that tell you how many beats there are in a bar
Examples from the Corpus
time signature• The dot indicators on each line of the staves give the position of each semi-quaver in a time signature of 4/4.• The enchaînements can be danced to any time signature, phrasing or tempo. 