Etymology
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espousal (n.)

late 14c., from Old French esposailles (plural) "act of betrothal" (12c., Modern French époussailles), from Latin sponsalia "betrothal, espousal, wedding," noun use of neuter plural of sponsalis "of a betrothal," from sponsa "spouse" (see espouse). For the -e- see e-. Figuratively, of causes, principles, etc., from 1670s.

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Definitions of espousal

espousal (n.)
archaic terms for a wedding or wedding feast;
Synonyms: bridal
espousal (n.)
the act of becoming betrothed or engaged;
Synonyms: betrothal
espousal (n.)
the act of accepting with approval; favorable reception;
Synonyms: adoption / acceptance / acceptation
From wordnet.princeton.edu