Source : Webster's Revised Unabridged Dictionary (1913)

Retrospection \Re`tro*spec"tion\, n.
   The act, or the faculty, of looking back on things past.

Source : WordNet®

retrospection
     n 1: reference to things past; "the story begins with no
          introductory retrospections"
     2: memory for experiences that are past; "some psychologists
        tried to contrast retrospection and introspection"