Source : Webster's Revised Unabridged Dictionary (1913)

Extemporary \Ex*tem"po*ra*ry\, a.
   1. Extemporaneous. ``In extemporary prayer.'' --Fuller.

   2. Made for the occasion; for the time being. [Obs.]
      ``Extemporary habitations.'' --Maundrell.

Source : WordNet®

extemporary
     adj : with little or no preparation or forethought; "his ad-lib
           comments showed poor judgment"; "an extemporaneous
           piano recital"; "an extemporary lecture"; "an extempore
           skit"; "an impromptu speech"; "offhand excuses";
           "trying to sound offhanded and reassuring"; "an
           off-the-cuff toast"; "a few unrehearsed comments" [syn:
            {ad-lib}, {extemporaneous}, {extempore}, {impromptu},
           {offhand}, {offhanded}, {off-the-cuff}, {unrehearsed}]