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1630s, from Latin quiescentia, from quiescere (see quiescent).
c.1600, from Latin quiescentem (nominative quiescens), present participle of quiescere, inchoative verb formed from quies "rest, quiet" (see quiet (n.)).
quiescent qui·es·cent (kwē-ěs'ənt, kwī-)adj. Being quiet, still, or at rest; inactive.