13 letters · 25 points in Scrabble
noun something (such as a fact or circumstance) that shows an action to be reasonable or necessary
noun a statement in explanation of some action or belief
noun the act of defending or explaining or making excuses for by reasoning; - H.J.Muller
originFrom Middle English justificacioun, justification, from Middle French justification, from Late Latin iustificationem, justificationem < iustificatio, from iustifico, from Latin iustus.
Etymology from Wiktionary, CC BY-SA 3.0