Source : Webster's Revised Unabridged Dictionary (1913)

Quiesce \Qui*esce"\, v. i. [imp. & p. p. {Quiesced}; p. pr. &
   vb. n. {Quiescing}.] [L. quiescere, akin to quies rest,
   quiet. See {Quiet}, a. & n.]
   To be silent, as a letter; to have no sound. --M. Stuart.