Late Middle English; earliest use found in Reginald Pecock (c1392–?1459), bishop of Chichester and religious author. From post-classical Latin justificabilis that justifies, subject to jurisdiction from justificare + classical Latin -bilis.
Definition of justificable in US English:
justificable
adjective
Able to be justified; = "justifiable".
Origin
Late Middle English; earliest use found in Reginald Pecock (c1392–?1459), bishop of Chichester and religious author. From post-classical Latin justificabilis that justifies, subject to jurisdiction from justificare + classical Latin -bilis.