Definitions:

1. a time signature indicating four beats to the bar noun
   • The first prelude and fugue in Bach's WellTempered Clavier are both in common measure.
2. the meter of a ballad alternating between iambic tetrameter and iambic trimeter noun
   • The hymn 'Amazing Grace' is in common measure.

Synonyms:

• common divisor
• common factor
• common meter
• common time
• four-four time
• quadruple time