The Collaborative International Dictionary of English v.0.48:

Juncture \Junc"ture\ (j[u^][ng]k"t[-u]r; 135), n. [L. junctura,
   fr. jungere to join. See Jointure.]
   1. A joining; a union; an alliance. [Obs.] "Devotional
      compliance and juncture of hearts." --Eikon Basilike.
      [1913 Webster]

   2. The line or point at which two bodies are joined; a joint;
      an articulation; a seam; as, the junctures of a vessel or
      of the bones. --Boyle.
      [1913 Webster]

   3. A point of time; esp., one made critical or important by a
      concurrence of circumstances; hence, a crisis; an
      exigency. "Extraordinary junctures." --Addison.
      [1913 Webster]

            In such a juncture, what can the most plausible and
            refined philosophy offer?             --Berkeley.
      [1913 Webster]

WordNet (r) 3.0 (2006):

juncture
    n 1: an event that occurs at a critical time; "at such junctures
         he always had an impulse to leave"; "it was needed only on
         special occasions" [syn: juncture, occasion]
    2: a crisis situation or point in time when a critical decision
       must be made; "at that juncture he had no idea what to do";
       "he must be made to realize that the company stands at a
       critical point" [syn: juncture, critical point,
       crossroads]
    3: the shape or manner in which things come together and a
       connection is made [syn: articulation, join, joint,
       juncture, junction]