English word spouse comes from Proto-Indo-European *pend-, and later Proto-Italic *spondeō (To promise, to pledge.)
*pend- (Proto-Indo-European)
*spondéyeti (Proto-Indo-European)
*spondeō (Proto-Italic)
To promise, to pledge.
sponsare (Latin)
spondere (Latin)
sponsa (Latin)
Bride. Fiancée (betrothed woman).
spouse (English)
A person in a marriage or marital relationship. (dated) To wed; to espouse.