Source : Webster's Revised Unabridged Dictionary (1913)

Exigency \Ex"i*gen*cy\, n.; pl. {Exigencies}. [LL. exigentia:
   cf. F. exigence.]
   The state of being exigent; urgent or exacting want; pressing
   necessity or distress; need; a case demanding immediate
   action, supply, or remedy; as, an unforeseen exigency. ``The
   present exigency of his affairs.'' --Ludlow.

   Syn: Demand; urgency; distress; pressure; emergency;
        necessity; crisis.

Source : WordNet®

exigency
     n 1: a pressing or urgent situation; "the health-care exigency"
     2: a sudden unforeseen crisis (usually involving danger) that
        requires immediate action; "he never knew what to do in an
        emergency" [syn: {emergency}, {pinch}]