Attemper

v. t.	1.	To reduce, modify, or moderate, by mixture; to temper; to regulate, as temperature. [imp. & p. p. Attempered ( ); p. pr. & vb. n. Attempering.] If sweet with bitter . . . were not attempered still. - Trench.
	2.	To soften, mollify, or moderate; to soothe; to temper; as, to attemper rigid justice with clemency.
	3.	To mix in just proportion; to regulate; as, a mind well attempered with kindness and justice.
	4.	To accommodate; to make suitable; to adapt. Arts . . . attempered to the lyre. - Pope.

Verb

1.

attemper - modify the temperature of; "attemper the air"

modify