[1] : The Collaborative International Dictionary of English v.0.48

voluminous \volu"minous\, a. l. voluminosus: cf. f.
   volumineux.
   of or pertaining to volume or volumes. specifically: 
   1913 webster
   a consisting of many folds, coils, or convolutions.
       1913 webster

             but ended foul in many a scaly fold,
             voluminous and vast.                 --milton.
       1913 webster

             over which dusky draperies are hanging, and
             voluminous curtains have long since fallen. --de
                                                  quincey.
       1913 webster
   b of great volume, or bulk; large. --b. jonson.
       1913 webster
   c consisting of many volumes or books; as, the collections
       of muratori are voluminous.
       1913 webster
   d having written much, or produced many volumes; copious;
       diffuse; as, a voluminous writer.
       1913 webster -- volu"minously, adv. --
       volu"minousness, n.
       1913 webster
see also:
volu"minously volu"minousness 

[2] : WordNet (r) 2.0

voluminous
     adj 1: large in volume or bulk; "a voluminous skirt"
     2: large in number or quantity especially of discourse; "she
        took copious notes"; "extensive press coverage"; "a
        subject of voluminous legislation" syn: copious, extensive
see also:
copious extensive 

[3] : Moby Thesaurus II by Grady Ward, 1.0

67 moby thesaurus words for "voluminous":
   gargantuan, ample, amplitudinous, astronomical, awesome, big,
   billowing, boundless, broad, bulky, capacious, cavernous, colossal,
   commodious, comprehensive, copious, cosmic, deep, enormous,
   expansive, extended, extending, extensive, far-reaching, galactic,
   generous, gigantic, great, huge, immeasurable, immense, infinite,
   king-size, large, legion, loose, mammoth, massive, massy, monster,
   monstrous, monumental, mountainous, multifarious, multitudinal,
   multitudinous, numerous, outsize, overgrown, oversized, populous,
   prodigious, roomy, several, sizable, spacious, spreading,
   stupendous, substantial, sundry, titanic, tremendous, various,
   vast, weighty, wide, widespread

Voluminous >> V Words
Voluminous, definition of term: Voluminous
voluminous_pag1.html