The Collaborative International Dictionary of English v.0.48:

Remittal \Re*mit"tal\ (-tal), n.
   A remitting; a giving up; surrender; as, the remittal of the
   first fruits. --Swift.
   [1913 Webster]

WordNet (r) 3.0 (2006):

remittal
    n 1: a payment of money sent to a person in another place [syn:
         remittance, remittal, remission, remitment]
    2: an abatement in intensity or degree (as in the manifestations
       of a disease); "his cancer is in remission" [syn:
       remission, remittal, subsidence]
    3: the act of absolving or remitting; formal redemption as
       pronounced by a priest in the sacrament of penance [syn:
       absolution, remission, remittal, remission of sin]