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]