(often + from) to free (somebody) from blame
(often + from) to relieve (somebody) of a responsibility or, obligation, or hardship
exoneration /-ʹraysh(ə)n/ noun
exonerative /-rətiv/ adj
[Middle English exoneraten from Latin exoneratus, past part. of exonerare to unburden, from ex-1 + oner-, onus load]