The Collaborative International Dictionary of English v.0.48:

Inundate \In*un"date\, v. t. [imp. & p. p. Inundated; p. pr. &
   vb. n. Inundating.] [L. inundatus, p. p. of inundare to
   inundate; pref. in- in + undare to rise in waves, to
   overflow, fr. unda a wave. See Undulate.]
   [1913 Webster]
   1. To cover with a flood; to overflow; to deluge; to flood;
      as, the river inundated the town.
      [1913 Webster]

   2. To fill with an overflowing abundance or superfluity; as,
      the country was inundated with bills of credit.

   Syn: To overflow; deluge; flood; overwhelm; submerge; drown.
        [1913 Webster]

WordNet (r) 3.0 (2006):

inundate
    v 1: fill quickly beyond capacity; as with a liquid; "the
         basement was inundated after the storm"; "The images
         flooded his mind" [syn: deluge, flood, inundate,
         swamp]
    2: fill or cover completely, usually with water [syn:
       inundate, deluge, submerge]