(1):
(v. t.) To soften, mollify, or moderate; to soothe; to temper; as, to attemper rigid justice with clemency.
(2):
(v. t.) To accommodate; to make suitable; to adapt.
(3):
(v. t.) To mix in just proportion; to regulate; as, a mind well attempered with kindness and justice.
(4):
(v. t.) To reduce, modify, or moderate, by mixture; to temper; to regulate, as temperature.