"justification" in the noun sense
something (such as a fact or circumstance) that shows an action to be reasonable or necessary
"he considered misrule a justification for revolution"
a statement in explanation of some action or belief
the act of defending or explaining or making excuses for by reasoning
"the justification of barbarous means by holy ends"- H.J.Muller
Source: WordNet® (An amazing lexical database of English)
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