Justify  v. (-ies, -ied) 1 show the justice or correctness of (a person, act, assertion, etc.). 2 (esp. In passive) cite or constitute adequate grounds for (conduct, a claim, etc.); vindicate. 3 (as justified adj.) Just, right (justified in assuming). 4 printing adjust (a line of type) to give even margins.  justification n. Justificatory adj.