The Collaborative International Dictionary of English v.0.48:

Conjuncture \Con*junc"ture\ (?; 135), n. [Cf. F. conjoncture,
   LL. conjunctura.]
   1. The act of joining, or state of being joined; union;
      connection; combination.
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            The conjuncture of philosophy and divinity.
                                                  --Hobbes.
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            A fit conjuncture or circumstances.   --Addison.
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   2. A crisis produced by a combination of circumstances;
      complication or combination of events or circumstances;
      plight resulting from various conditions.
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            He [Chesterfield] had recently governed Ireland, at
            a momentous conjuncture, with eminent firmness,
            wisdom, and humanity.                 --Macaulay.
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WordNet (r) 3.0 (2006):

conjuncture
    n 1: a critical combination of events or circumstances