Source : Webster's Revised Unabridged Dictionary (1913)

Quiescence \Qui*es"cence\, Quiescency \Qui*es"cen*cy\, n. [L.
   quiescentia, fr. quiescens, p. pr.; cf. F. quiestence. See
   {Quiesce}.]
   The state or quality of being quiescent. ``Quiescence, bodily
   and mental.'' --H. Spencer.

         Deeds will be done; -- while be boasts his quiescence.
                                                  --R. Browning.

Source : WordNet®

quiescency
     n 1: a state of quiet (but possibly temporary) inaction; "the
          volcano erupted after centuries of dormancy" [syn: {dormancy},
           {quiescence}]
     2: quiet and inactive restfulness [syn: {quiescence}, {dormancy},
         {sleeping}]