Webster's Revised Unabridged Dictionary · 1913

Quiescence

Quiescence , noun

[Latin quiescentia, from quiescens, p. pr.; compare French 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

Also: Quiescency