Source : Webster's Revised Unabridged Dictionary (1913)

Conjuncture \Con*junc"ture\ (?; 135), n. [Cf. F. conjoncture,
   LL. conjunctura.]
   1. The act of joining, or state of being joined; union;
      connection; combination.

            The conjuncture of philosophy and divinity.
                                                  --Hobbes.

            A fit conjuncture or circumstances.   --Addison.

   2. A crisis produced by a combination of circumstances;
      complication or combination of events or circumstances;
      plight resulting from various conditions.

            He [Chesterfield] had recently governed Ireland, at
            a momentous conjuncture, with eminent firmness,
            wisdom, and humanity.                 --Macaulay.

Source : WordNet®

conjuncture
     n : a critical combination of events or circumstances