transitive verb
at·tem·per | \əˈtempə(r), aˈ-\

Definition of attemper 

1 obsolete : regulate, control, order

2 archaic

a : soften, mitigate

b : soothe, appease

3a archaic : to reduce, modify, or moderate by mixture

b : to modify the temperature of : make (as air) warmer or colder

4 archaic : to make suitable : accommodate, adapt

5 archaic : to bring into harmony : attune

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History and Etymology for attemper

Middle English attempren, from Middle French atemprer, from Latin attemperare to adjust, accommodate, from ad- + temperare to temper

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