Common time, also known as "4/4 time," is a widely used time signature in music that contains four beats in each measure. However, there are several synonyms for this term, including "simple time" and "quadruple meter." Simple time refers to time signatures in which the beat is divisible by two, while quadruple meter refers to time signatures with four beats per measure. Other synonyms for common time include "regular time" and "plain time." While all these terms refer to the same time signature, each offers a slightly different perspective on how it can be understood and used in musical compositions.