The Collaborative International Dictionary of English v.0.48:

Retrieval \Re*triev"al\, n.
   The act retrieving.
   [1913 Webster]

WordNet (r) 3.0 (2006):

retrieval
    n 1: (computer science) the operation of accessing information
         from the computer's memory
    2: the cognitive operation of accessing information in memory;
       "my retrieval of people's names is very poor"
    3: the act of regaining or saving something lost (or in danger
       of becoming lost) [syn: recovery, retrieval]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "retrieval":
   deliverance, delivery, extrication, freeing, liberation,
   lifesaving, ransom, recapture, reclaiming, reclamation, recoup,
   recoupment, recovery, recuperation, redemption, regainment,
   release, reoccupation, replevin, replevy, repossession, rescue,
   restoration, resumption, retake, retaking, retrieve, revindication,
   revival, salvage, salvation, saving, trover