Artificial intelligent assistant

placidity

placidity
  (pləˈsɪdɪtɪ)
  [ad. L. placiditās, f. placidus placid: see -ity. So F. placidité (1878 in Dict. Acad.).]
  The quality of being placid; mildness, calmness, tranquillity, peacefulness.

1619 W. Sclater Exp. 1 Thess. (1630) 142 First Meeknesse; secondly Placiditie, as for want of a plainer terme, I am forced to call it. 1766 Chandler Life David I. ii. 36 He..behaves with the utmost placidity, moderation, and calmness. 1816 G. Crabb Eng. Synonymes 187/2 Placidity is more of a natural gift; serenity is acquired. 1866 G. Macdonald Ann. Q. Neighb. xix. (1878) 360 All the placidity of his countenance had vanished.

Oxford English Dictionary

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