Source : Webster's Revised Unabridged Dictionary (1913)

Pluperfect \Plu"per`fect\, a. [L. plus more + perfectus perfect;
   cf. F. plus-que-parfait, L. plusquamperfectum.]
   More than perfect; past perfect; -- said of the tense which
   denotes that an action or event was completed at or before
   the time of another past action or event. -- n. The
   pluperfect tense; also, a verb in the pluperfect tense.

Source : WordNet®

pluperfect
     adj : more than perfect; "he spoke with pluperfect precision"
     n : a perfective tense used to express action completed in the
         past; "`I had finished' is an example of the past
         perfect" [syn: {past perfect}, {past perfect tense}, {pluferfect
         tense}]