Definition: micro-

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Source: WordNet (r) 1.7 

micro
     adj : extremely small in scale or scope or capability

Source: Webster's Revised Unabridged Dictionary (1913) 

Micro- \Mi"cro-\, Micr- \Mi"cr-\ . [Gr. mikro`s small.]
   A combining form signifying:
   (a) Small, little, trivial, slight; as, microcosm,
       microscope.
   (b) (Metric System, Elec., Mech., etc.) A millionth part of;
       as, microfarad, microohm, micrometer.

Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

micro-

   prefix
micro

   microprocessor

Source: Jargon File (4.3.1, 29 Jun 2001) 

micro- pref. 1. Very small; this is the root of its use as a quantifier
   prefix. 2. A quantifier prefix, calling for multiplication by 10^(-6)
   (see quantifiers). Neither of these uses is peculiar to hackers, but
   hackers tend to fling them both around rather more freely than is
   countenanced in standard English. It is recorded, for example, that one
   CS professor used to characterize the standard length of his lectures as
   a microcentury -- that is, about 52.6 minutes (see also attoparsec,
   nanoacre, and especially microfortnight). 3. Personal or human-scale
   -- that is, capable of being maintained or comprehended or manipulated
   by one human being. This sense is generalized from `microcomputer', and
   is esp. used in contrast with `macro-' (the corresponding Greek prefix
   meaning `large'). 4. Local as opposed to global (or macro-). Thus a
   hacker might say that buying a smaller car to reduce pollution only
   solves a microproblem; the macroproblem of getting to work might be
   better solved by using mass transit, moving to within walking distance,
   or (best of all) telecommuting.

Source: U.S. Gazetteer (1990) 

Micro, NC (town, FIPS 42620)
  Location: 35.56264 N, 78.20416 W
  Population (1990): 417 (193 housing units)
  Area: 1.0 sq km (land), 0.0 sq km (water)