U

attemper

verb (used with object) Archaic.

to modify or moderate by mixing or blending with something different or opposite.
to regulate or modify the temperature of.
to soothe; mollify; mitigate.
to accommodate; adapt (usually followed by to).

verb (tr) archaic

to modify by blending; temper
to moderate or soothe
to accommodate or bring into harmony

late 14c., from Old French attemprer, from Latin attemperare, from ad- “to” (see ad-) + temperare (see temper (v.)). Related: Attempered; attempering.