verb (imperative), Music.
be silent (directing an instrument or voice not to play or sing).
(intransitive) (on a musical score) a direction indicating that a particular instrument or singer does not take part in a movement or part of a movement
noun, Informal. 1. tachometer. tablet tach tachometer
combining form 1. a variant of tachy-
noun 1. (surveying) a type of theodolite designed for the rapid measurement of distances, elevations, and directions
noun 1. (surveying) the measurement of distance, etc, using a tacheometer