Mus. [L., = ‘is silent,’ from tacēre to be silent.] A direction that the voice or instrument is to be silent for a time.

1

1724.  Short Explic. For. Wds. in Mus. Bks., Tace or Tacet, to hold still, or keep Silence.

2

1789.  Rees, Chambers’ Cycl., Tacet, in the Italian Music, is often used to denote a long rest, or pause.

3

1823.  in Crabb, Techn. Dict., etc.

4