- a musical composition scored for piano and three other instruments, typically violin, viola, and cello.
- an instrumental group consisting of a pianist and three other musicians, typically a violinist, violist, and cellist.
- a group of four pianists playing music written or arranged for four pianos.
Origin of piano quartet
First recorded in 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018