Synonyms for Marriage (same or very similar meaning)
WordNet sense 1 (the state of being a married couple voluntarily joined for life (or until divorce)):
matrimony, union, wedlock, spousal relationshipWordNet sense 2 (two people who are married to each other):
man and wife, married coupleWordNet sense 3 (the act of marrying; the nuptial ceremony):
wedding, marriage ceremonyFrom the ODE community, based on WordNetadd/edit