affiance (v.)
betroth, engage, promise solemnly
MM III.i.215[disguised Duke to Isabella, of Mariana] Angelo ... was affianced to her by oath
MM V.i.225[Mariana to Duke, of Angelo] I am affianced this man's wife as strongly / As words could make up vows
SHAKESPEARE'S WORDS © 2018 DAVID CRYSTAL & BEN CRYSTAL