affiance
/əˈfʌɪəns
/verb (be affianced) literary
Be engaged to marry: Edward was affianced to Lady Eleanor Butler (as adjective affianced) an affianced couple...
- But she has affianced her daughter to a promising young man in a prosperous Korean family.
- She and Gabriel are affianced, she added as an after thought.
- The Council ordered me to be affianced to you.
Origin
Late 15th century: from Old French afiancer, from afier 'promise, entrust', from medieval Latin affidare 'declare on oath', from ad- 'towards' + fides 'trust'.