[syn: across-the-board, all-embracing, all-encompassing, all-inclusive, blanket(a), broad, encompassing, extensive, panoptic, wide]
3.  of agriculture;  increasing productivity by using large areas with minimal outlay and labor; 
- Example: "producing wheat under extensive conditions"
- Example: "agriculture of the extensive type"
The Collaborative International Dictionary of English v.0.48:
Extensive \Ex*ten"sive\, a. [L. extensivus: cf. F. extensif. See
   Extend.]
   1. Having wide extent; of much superficial extent; expanded;
      large; broad; wide; comprehensive; as, an extensive farm;
      an extensive lake; an extensive sphere of operations;
      extensive benevolence; extensive greatness.
      [1913 Webster]
   2. Capable of being extended. [Obs.]
      [1913 Webster]
            Silver beaters choose the finest coin, as that which
            is most extensive under the hammer.   --Boyle.
      [1913 Webster]
WordNet (r) 3.0 (2006):
extensive
    adj 1: large in spatial extent or range or scope or quantity;
           "an extensive Roman settlement in northwest England";
           "extended farm lands"; "surgeons with extended
           experience"; "they suffered extensive damage" [syn:
           extensive, extended]
    2: broad in scope or content; "across-the-board pay increases";
       "an all-embracing definition"; "blanket sanctions against
       human-rights violators"; "an invention with broad
       applications"; "a panoptic study of Soviet nationality"-
       T.G.Winner; "granted him wide powers" [syn: across-the-
       board, all-embracing, all-encompassing, all-inclusive,
       blanket(a), broad, encompassing, extensive,
       panoptic, wide]
    3: of agriculture; increasing productivity by using large areas
       with minimal outlay and labor; "producing wheat under
       extensive conditions"; "agriculture of the extensive type"
       [ant: intensive]
Moby Thesaurus II by Grady Ward, 1.0:
107 Moby Thesaurus words for "extensive":
   Gargantuan, a mile long, all-embracing, ample, amplitudinous,
   astronomical, awesome, big, boundless, broad, bulky, capacious,
   catholic, colossal, commodious, comprehensive, considerable,
   copious, cosmic, cosmopolitan, deep, diffuse, dilatant, distensive,
   elastic, enormous, expansible, expansile, expansional, expansive,
   extended, extending, extensile, extensional, far-embracing,
   far-extending, far-flung, far-flying, far-going, far-ranging,
   far-reaching, fargoing, full, galactic, general, generous,
   gigantic, global, great, huge, immeasurable, immense, inclusive,
   indiscriminate, infinite, inflatable, inflationary, interminable,
   international, king-size, large, large-scale, lengthy, liberal,
   long, longish, longsome, mammoth, massive, massy, monster,
   monstrous, monumental, mountainous, national, no end of, outsize,
   overgrown, prodigious, roomy, scopic, sesquipedal, sesquipedalian,
   sizable, sizeable, spacious, spreading, stupendous, substantial,
   sweeping, tall, titanic, tremendous, universal, vast, voluminous,
   weighty, wholesale, wide, wide-extended, wide-extending,
   wide-ranging, wide-reaching, wide-stretching, widespread,
   without end, worldwide