Source : Webster's Revised Unabridged Dictionary (1913)

Postponement \Post*pone"ment\, n.
   The act of postponing; a deferring, or putting off, to a
   future time; a temporary delay. --Macaulay.

Source : WordNet®

postponement
     n 1: time during which some action is awaited; "instant replay
          caused too long a delay"; "he ordered a hold in the
          action" [syn: {delay}, {hold}, {time lag}, {wait}]
     2: act of putting off to a future time [syn: {deferment}, {deferral}]