D defs.my
Entry 4 senses Webster, 1913

Attemper

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