Etymology
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attemper (v.)

late 14c., "reduce, moderate, modify; restrain, control; make fit or suitable; mix in just proportion," from Old French atemprer "become moderate, regulate one's actions, take the middle way," from Latin attemperare, from assimilated form of ad "to" (see ad-) + temperare "to mix in due proportion, modify, blend; restrain oneself" (see temper (v.)). Related: Attempered; attempering.

updated on March 01, 2017

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Definitions of attemper from WordNet

attemper (v.)
modify the temperature of;
attemper the air
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.