tacet
musical direction
ta·cet ˈtā-sət 
ˈta-sət ˈtä-ˌket
ˈta-sət ˈtä-ˌket —used as a direction in music to indicate that an instrument is not to play during a movement or long section
Word History
Etymology
Latin, literally, (it) is silent, from tacēre to be silent — more at tacit
First Known Use
circa 1724, in the meaning defined above