Meaning of piano quartet

pian'o quartet'

Pronunciation: [key]
  1. a musical composition scored for piano and three other instruments, typically violin, viola, and cello.
  2. an instrumental group consisting of a pianist and three other musicians, typically a violinist, violist, and cellist.
  3. a group of four pianists playing music written or arranged for four pianos.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.