The Collaborative International Dictionary of English v.0.48:

Nuptial \Nup"tial\, n.; pl. Nuptials (n[u^]p"shalz).
   Marriage; wedding; nuptial ceremony; -- now only in the
   plural.
   [1913 Webster]

         Celebration of that nuptial, which
         We two have sworn shall come.            --Shak.
   [1913 Webster]

         Preparations . . . for the approaching nuptials.
                                                  --Prescott.
   [1913 Webster]

WordNet (r) 3.0 (2006):

nuptials
    n 1: the social event at which the ceremony of marriage is
         performed [syn: wedding, wedding ceremony, nuptials,
         hymeneals]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "nuptials":
   Gretna Green wedding, banns, bridal, bridal suite, bridechamber,
   chuppah, church wedding, civil ceremony, civil wedding, elopement,
   epithalamium, espousals, espousement, forced marriage, honeymoon,
   hymen, hymeneal, hymeneal rites, marriage, nuptial apartment,
   nuptial mass, nuptial song, prothalamium, saffron veil,
   shotgun wedding, spousal, spousals, wedding, wedding canopy,
   wedding song, wedding veil