The Collaborative International Dictionary of English v.0.48:

Galore \Ga*lore"\, n. & a. [Scot. gelore, gilore, galore, fr.
   Gael. gu le[`o]r, enough; gu- to, also an adverbial prefix +
   le[`o]r, le[`o]ir, enough; or fr. Ir. goleor, the same word.]
   Plenty; abundance; in abundance.
   [1913 Webster]

WordNet (r) 3.0 (2006):

galore
    adj 1: in great numbers; "daffodils galore"
    2: existing in abundance; "abounding confidence"; "whiskey
       galore" [syn: abounding, galore(ip)]

Moby Thesaurus II by Grady Ward, 1.0:

86 Moby Thesaurus words for "galore":
   a deal, a great deal, a lot, abounding, abundant, abundantly,
   affluent, all-sufficing, ample, aplenty, as all creation,
   as all get-out, beaucoup, bottomless, bounteous, bountiful,
   considerable, considerably, copious, diffuse, effuse, epidemic,
   ever so, ever so much, everywhere, exhaustless, extravagant,
   exuberant, fat, fertile, flush, full, generous, greatly, highly,
   in abundance, in excess, in great measure, in plenty, in profusion,
   in quantity, inexhaustible, largely, lavish, liberal, luxuriant,
   many, maximal, much, muchly, never so, no end, no end of,
   not a little, numerous, opulent, overflowing, plenitudinous,
   plenteous, plentiful, plenty, pretty much, prevailing, prevalent,
   prodigal, productive, profuse, profusive, rampant, replete, rich,
   rife, riotous, running over, so, so very much, superabundant,
   teeming, to the skies, very much, wealthy, well-found,
   well-furnished, well-provided, well-stocked, wholesale