To justify something is to give good reasons or explanations that show it is fair, right, or reasonable. It can also mean to adjust text so that both edges line up straight on a page.
From Old French “justifier” meaning “to act justly, to make just”, from Latin “iustificare” (to make righteous), from “iustus” (just) and “facere” (to make). It originally had strong moral and religious meanings.
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