justification

nouns

something (such as a fact or circumstance) that shows an action to be reasonable or necessary
"he considered misrule a justification for revolution"
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information that should be kept in mind when making a decision
"another consideration is the time it would take"
a statement in explanation of some action or belief
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a statement that makes something comprehensible by describing the relevant structure or operation or circumstances etc.
"the explanation was very simple"; "I expected a brief account"
the act of defending or explaining or making excuses for by reasoning
"the justification of barbarous means by holy ends"- H.J.Muller
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the act of vindicating or defending against criticism or censure etc.
"friends provided a vindication of his position"