justification
jus·ti·fi·cation
noun
1.
something (such as a fact or circumstance) that shows an action to be reasonable or necessary
- “he considered misrule a justification for revolution”
2.
a statement in explanation of some action or belief
Origin
From Middle English justificacioun, justification, from Middle French justification, from Late Latin iustificationem, justificationem < iustificatio, from iustifico, from Latin iustus.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.