EXCULPATION
exculpation
(noun) the act of freeing from guilt or blame
excuse, alibi, exculpation, self-justification
(noun) a defense of some offensive behavior or some failure to keep a promise etc.; “he kept finding excuses to stay”; “every day he had a new alibi for not getting a job”; “his transparent self-justification was unacceptable”
Source: WordNet® 3.1
Noun
exculpation (countable and uncountable, plural exculpations)
The act of exculpating from alleged fault or crime.
That which exculpates; an excuse.
Source: Wiktionary
Ex`cul*pa"tion, n. Etym: [Cf. LL. exculpatio.]
Definition: The act of exculpating from alleged fault or crime; that which
exculpates; excuse.
These robbers, however, were men who might have made out a strong
case in exculpation of themselves. Southey.
Source: Webster’s Unabridged Dictionary 1913 Edition