Definition of betrothal noun from the Oxford Advanced Learner's Dictionary

 

betrothal

 noun
noun
BrE BrE//ˈtrəʊðl//
 
; NAmE NAmE//ˈtroʊðl//
 
 
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betrothal (to somebody) (formal or old-fashioned) an agreement to marry somebody synonym engagement Word Origin From Middle English betreuthe: from be- (expressing transitivity) + truth. The change in the second syllable was due to association with troth + -al.
See the Oxford Advanced American Dictionary entry: betrothal