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The Collaborative International Dictionary
Asperation

Asperation \As`per*a"tion\, n. The act of asperating; a making or becoming rough.
--Bailey. [1913 Webster] ||

Douglas Harper's Etymology Dictionary
asperation

1721, noun of action from asperate (v.). Asperacioun "harshness" is attested from early 15c.

Wiktionary
asperation

n. The act of asperate; a making or becoming rough.