The Collaborative International Dictionary of English v.0.48:

Shrift \Shrift\, n. [OE. shrift, schrift, AS. scrift, fr.
   scr[imac]fan to shrive. See Shrive.]
   1. The act of shriving.
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            In shrift and preaching is my diligence. --Chaucer.
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   2. Confession made to a priest, and the absolution consequent
      upon it. --Chaucer.
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            Have you got leave to go to shrift to-day? --Shak.
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            Therefore, my lord, address you to your shrift,
            And be yourself; for you must die this instant.
                                                  --Rowe.
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   Shrift father, a priest to whom confession is made.
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WordNet (r) 3.0 (2006):

shrift
    n 1: the act of being shriven

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "shrift":
   absolution, acknowledgment, admission, amnesty, avowal, concession,
   confession, exculpation, excuse, exemption, exoneration, grace,
   immunity, indemnity, owning, owning up, pardon, redemption,
   remission, remission of sin, reprieve, rite of confession, sparing,
   unbosoming