The Collaborative International Dictionary of English v.0.48:

Opportunity \Op`por*tu"ni*ty\, n.; pl. Opportunities. [F.
   opportunit['e], L. opportunitas. See Opportune.]
   1. Fit or convenient time or situation; a time or place
      permitting or favorable for the execution of a purpose; a
      suitable combination of conditions; suitable occasion;
      chance.
      [1913 Webster +PJC]

            A wise man will make more opportunities than he
            finds.                                --Bacon.
      [1913 Webster]

   2. Convenience of situation; fitness. [Obs.]
      [1913 Webster]

            Hull, a town of great strength and opportunity, both
            to sea and land affairs.              --Milton.
      [1913 Webster]

   3. Importunity; earnestness. [Obs.] --Jer. Taylor.
      [1913 Webster]

   Syn: Occasion; convenience; occurrence.

   Usage: Opportunity, Occasion. An occasion is that which
          falls in our way, or presents itself in the course of
          events; an opportunity is a convenience or fitness of
          time, place, etc., for the doing of a thing. Hence,
          occasions often make opportunities. The occasion of
          sickness may give opportunity for reflection.
          [1913 Webster]

The Devil's Dictionary (1881-1906):

OPPORTUNITY, n.  A favorable occasion for grasping a disappointment.


U.S. Gazetteer (1990):

Opportunity, WA (CDP, FIPS 51515)
  Location: 47.64945 N, 117.24045 W
  Population (1990): 22326 (8917 housing units)
  Area: 17.3 sq km (land), 0.0 sq km (water)

Moby Thesaurus II by Grady Ward, 1.0:

75 Moby Thesaurus words for "opportunity":
   a leg up, accidentality, actuarial calculation, adventitiousness,
   bout, break, casualness, chance, clear stage, destiny, fair field,
   fair game, fate, flukiness, fortuitousness, fortuity, fortune,
   gamble, go, good fortune, good luck, hap, happenstance,
   happy chance, heedless hap, hope, how they fall, indeterminacy,
   indeterminateness, inning, innings, juncture, law of averages,
   leisure, liberty, look-in, lot, luck, moira, moment, occasion,
   opening, opportunism, pass, place, possibility, prayer,
   principle of indeterminacy, probability, problematicness,
   random sample, relief, risk, room, round, run of luck, say, scope,
   serendipity, shot, show, space, spell, squeak,
   statistical probability, stepping-stone, the breaks,
   theory of probability, time, time at bat, turn, uncertainty,
   uncertainty principle, whack, whatever comes