betrothal

1 ENTRIES FOUND:
betrothal /bɪˈtroʊðəl/ noun
plural betrothals
betrothal
/bɪˈtroʊðəl/
noun
plural betrothals
Britannica Dictionary definition of BETROTHAL
[count] formal + old-fashioned
1 
: the act of promising to marry someone : engagement
2 
: an agreement that two people will be married in the future