1. calmness, restfulness, quiet, absence of activity. quiescencequi*escence , quiescency qui*escen*cy , ] n. [l. quiescentia, fr. quiescens, p. pr.; cf. f. quiestence. see: quiesce.] the state or quality of being quiescent. quiescence, bodily and mental. spencer. deeds will be done; -- while be boasts his quiescence. browning.quiescence n