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]

The Collaborative International Dictionary of English v.0.48:

Nuptial \Nup"tial\ (n[u^]p"shal), a. [L. nuptialis, fr. nuptiae
   marriage, wedding, fr. nubere, nuptum, prop., to cover, to
   veil, hence, to marry, as the head of the bride was covered
   with a veil; cf. Gr. ? bride, nymph: cf. F. nuptial.]
   Of or pertaining to marriage; done or used at a wedding; as,
   nuptial rites and ceremonies.
   [1913 Webster]

         Then, all in heat,
         They light the nuptial torch.            --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

nuptial
    adj 1: of or relating to a wedding; "bridal procession";
           "nuptial day"; "spousal rites"; "wedding cake"; "marriage
           vows" [syn: bridal, nuptial, spousal]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "nuptial":
   amorous, bridal, carnal, conjugal, connubial, epithalamic,
   erogenic, erogenous, erotic, erotogenic, fleshly, gamic,
   heterosexual, husbandly, hymeneal, libidinal, marital, married,
   matrimonial, oversexed, potent, procreative, sensual, sex, sexed,
   sexlike, sexual, sexy, spousal, straight, undersexed, venereal,
   voluptuous, wedded, wedding, wifely