instant

a.

  1. Pressing; urgent; importunate; earnest.
  2. Closely pressing or impending in respect to time; not deferred; immediate; without delay.
  3. Present; current.
  4. A point in duration; a moment; a portion of time too short to be estimated; also, any particular moment.
  5. A day of the present or current month; as, the sixth instant; -- an elliptical expression equivalent to the sixth of the month instant, i. e., the current month. See Instant, a., 3.

adv.

  1. Instantly.