Exigent

Ex·i·gent

Exigent

a.
  1. Exacting or requiring immediate aid or action; pressing; critical.

Exigent

n.
  1. Exigency; pressing necessity; decisive moment. [Obs.]
    Why do you cross me in this exigent?
  2. The name of a writ in proceedings before outlawry. (o. Eng. Law)