Explaining or proving that something is right, reasonable, or necessary.
From Old French 'justifier,' derived from Latin 'justificire' combining 'justus' (just/right) + 'facere' (to make). The term entered English in the 13th century.
In typography, 'justifying' text means aligning it perfectly to both left and right margins—it comes from the same root as the moral meaning because both require making things 'straight' or 'correct' in their own way.
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