The definition of quiescent is something or someone dormant or in a period of inactivity.(adjective)
An example of something that would be described as quiescent is a tumor that is dormant and not causing any type of health problems or growing at the time.
See quiescent in Webster's New World College Dictionary
Origin: L quiescens, prp. of quiescere, to become quiet: see quiet
See quiescent in American Heritage Dictionary 4
Origin: Latin quiēscēns, quiēscent-
Origin: , present participle of quiēscere, to rest
Origin: , from quiēs, quiet; see quiet.
Learn more about quiescent