The Collaborative International Dictionary of English v.0.48:

amnesty \am"nes*ty\ ([a^]m"n[e^]s*t[y^]), n. [L. amnestia, Gr.
   'amnhsti`a, a forgetting, fr. 'a`mnhstos forgotten,
   forgetful; 'a priv. + mna^sqai to remember: cf. F. amnistie,
   earlier amnestie. See Mean, v.]
   1. Forgetfulness; cessation of remembrance of wrong;
      oblivion.
      [1913 Webster]

   2. An act of the sovereign power granting oblivion, or a
      general pardon, for a past offense, as to subjects
      concerned in an insurrection.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Amnesty \Am"nes*ty\, v. t. [imp. & p. p. Amnestied; p. pr. &
   vb. n. Amnestying.]
   To grant amnesty to.
   [1913 Webster]

The Devil's Dictionary (1881-1906):

AMNESTY, n.  The state's magnanimity to those offenders whom it would
be too expensive to punish.


Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "amnesty":
   absolution, exculpation, excuse, exemption, exoneration, grace,
   immunity, impunity, indemnity, nolle prosequi, non prosequitur,
   nonprosecution, pardon, redemption, remission, remission of sin,
   reprieve, shrift, sparing, stay