The Collaborative International Dictionary of English v.0.48:

Collective \Col*lect"ive\, a. [L. collectivus: cf. F.
   collectif.]
   1. Formed by gathering or collecting; gathered into a mass,
      sum, or body; congregated or aggregated; as, the
      collective body of a nation. --Bp. Hoadley.
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   2. Deducing consequences; reasoning; inferring. [Obs.]
      "Critical and collective reason." --Sir T. Browne.
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   3. (Gram.) Expressing a collection or aggregate of
      individuals, by a singular form; as, a collective name or
      noun, like assembly, army, jury, etc.
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   4. Tending to collect; forming a collection.
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            Local is his throne . . . to fix a point,
            A central point, collective of his sons. --Young.
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   5. Having plurality of origin or authority; as, in diplomacy,
      a note signed by the representatives of several
      governments is called a collective note.
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   Collective fruit (Bot.), that which is formed from a mass
      of flowers, as the mulberry, pineapple, and the like; --
      called also multiple fruit. --Gray.
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WordNet (r) 3.0 (2006):

multiple fruit
    n 1: fruit consisting of many individual small fruits or drupes
         derived from separate ovaries within a common receptacle:
         e.g. blackberry; raspberry; pineapple [syn: aggregate
         fruit, multiple fruit, syncarp]