Definition of affidation in English:

affidation

noun

historical
  • Sworn confirmation of a fact, promise, or obligation; especially sworn confirmation of one's intent to marry.

Origin

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.

Pronunciation:

affidation

/ˌafɪˈdeɪʃn/