Archaic or rare term: the act of making something common or ordinary; the process of becoming common or widespread.
From common plus -efaction, derived from Latin facere (to make). This appears rarely in historical texts and is essentially obsolete.
This word practically doesn't exist in modern English—it's so obscure that historical texts skip right over it. But it shows how English once had more words for 'becoming common,' before we simplified the language.
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