English
justifier
From justify + -er.
A compound of justify + -er
Proto-Indo-European *h₂yew- ‘right, justice, law’
…
Latin iūstus ‘just’
Late Latin justificare ‘make just’
Old French justifier ‘to show to be innocent’
Middle English justifien
English justify
Today it means
noun One who, or that which, justifies some belief or action.
Language periods are conventional ranges, not dates for this word.
Etymograph / justifier