One of the mysteries of the English language finally explained.
Sworn confirmation of a fact, promise, or obligation; especially sworn confirmation of one's intent to marry.
Early 17th century; earliest use found in Samuel Daniel (?1563–1619), poet and historian. From post-classical Latin affīdation-, affīdatio solemn promise, declaration on oath, betrothal from affīdat-, past participial stem of affīdare + classical Latin -iō.
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