amnesty (n.)

1570s, "a ruling authority's pardon of past offenses," from French amnistie "intentional overlooking" (16c.), from Latin amnestia, from Greek amnestia "forgetfulness (especially of wrong); an amnesty," from amnestos "forgotten; forgetful," from a- "not" (see a- (3)) + mnestis "remembrance," which is related to mnaomai "I remember," from PIE root *men- (1) "to think."

Usually specifically of pardons or offers of pardon for a class of offenses against a government. As a verb from 1809. The non-governmental organization Amnesty International was founded 1961 to call attention to the plight of prisoners of conscience, as Appeal for Amnesty; the name was changed 1963.

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Definitions of amnesty from WordNet
amnesty (n.)
a period during which offenders are exempt from punishment;
amnesty (n.)
a warrant granting release from punishment for an offense;
Synonyms: pardon
amnesty (n.)
the formal act of liberating someone;
Synonyms: pardon / free pardon
amnesty (v.)
grant a pardon to (a group of people);