Webster's Revised Unabridged Dictionary · 1913

Affiance

Affiance (af*fī"ans) , noun

[Old English afiaunce trust, confidence, Old French afiance, from afier to trust, from Late Latin affidare to trust; ad + fidare to trust, from Latin fides faith. See Faith, and compare Affidavit, Affy, Confidence.]

1.
Plighted faith; marriage contract or promise. [archaic]
2.
Trust; reliance; faith; confidence. [archaic]
Such feelings promptly yielded to his habitual affiance in the divine love. — Sir J. Stephen
Lancelot, my Lancelot, thou in whom I have Most joy and most affiance. — Tennyson

affiance (af*fī"anst) , transitive verb

[Compare Old French afiancier, from afiance.]

1.
To betroth; to pledge one's faith to for marriage, or solemnly promise (one's self or another) in marriage.
To me, sad maid, he was affianced. — Spenser
2.
To assure by promise. [Obsolete] — Pope