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From The Collaborative International Dictionary of English v.0.48:
Justifier \Jus"ti*fi`er\, n. One who justifies; one who vindicates, supports, defends, or absolves. [1913 Webster] Justifiers of themselves and hypocrites. --Strype. [1913 Webster] That he might be just, and the justifier of him which believeth in Jesus. --Rom. iii. 26. [1913 Webster]