a numerical or other indication at the beginning of a piece showing the meter.
Origin of time signature
First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for time signature
music a sign usually consisting of two figures, one above the other, the upper figure representing the number of beats per bar and the lower one the time value of each beat. This sign is placed after the key signature at the outset of a piece or section of a piece
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012