
1) Mitigate 2) Modify 3) Modify the temperature of 4) Mollify 5) To accommodate 6) To mitigate, assuage 7) To soothe
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https://www.crosswordclues.com/clue/attemper

to adapt or alter quality by adding to something
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http://phrontistery.info/a.html

• (v. t.) To soften, mollify, or moderate; to soothe; to temper; as, to attemper rigid justice with clemency. • (v. t.) To accommodate; to make suitable; to adapt. • (v. t.) To reduce, modify, or moderate, by mixture; to temper; to regulate, as temperature. • (v. t.) To mix in just proportion; to regulate; as, a mind well attemp...
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http://thinkexist.com/dictionary/meaning/attemper/

At·tem'per transitive verb [ imperfect & past participle Attempered ; present participle & verbal noun Attempering .] [ Old French atemprer , from Latin attemperare ; ad + temperare to soften, temper. See
Found on
http://www.encyclo.co.uk/webster/A/142

[
v] - modify the temperature of, as of air
Found on
http://www.webdictionary.co.uk/definition.php?query=attemper
verb modify the temperature of; `attemper the air`
Found on
https://www.encyclo.co.uk/local/20974

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 fol. by to).
Found on
https://www.infoplease.com/dictionary/attemper
No exact match found.