Obs. rare–1. [ad. med.L. affīdātiōn-em, f. affīdā-re: see AFFIDAVIT and -TION.] A solemn promise of fidelity.
1613. Daniel, Hist. Eng., 62. The Empresse swore, and made affidation to the Legat…. The same oath and affidation tooke likewise her brother Robert.
