In mathematics,
a measure is a way to assign non-negative
real
numbers to subsets of a given set,
in order to "measure their sizes or probabilities". See
measure
(mathematics) for a treatment of the concept.
In music,
a measure is a unit of time in Western
music. It represents a regular grouping of beats, as indicated
in notation by the time
signature. Measures are also called bars,
since measures are separated by vertical bars (called bar
lines) in musical
notation.
