Where does “vengeance” come from?

Vengeance comes from Old French vengeaunce, derived from Old French venjance with the suffix Old French -ance, which developed from Latin -antia.

vengeance (English): Revenge taken for an insult, injury, or other...

Definitions

Step	Language	Word	Meaning
1	Anglo-Norman	vengeaunce	Alternative form of venjance
2	Old French	vengeance	Alternative form of venjance
3	Old French	vengier	to avenge, to take revenge
4	Latin	vindicō	to lay claim to as one's own (often with sibi)
5	Latin	vindex	claimant, vindicator
6	Latin	dīcō	to say, talk, speak, utter, mention
7	Latin	-tiō	tion, -ation, -ing
8	Latin	dissertātiō	(spoken) dissertation, discourse, disquisition
9	Latin	dissertus	arranged, disposed; explained
10	Latin	disserere	second-person singular future passive indicative...
11	Latin	dis-	asunder, apart, in two; reversal, removal;...
12	Latin	calceus	shoe
13	Latin	calx	limestone; chalk; the finish line
14	Ancient Greek	χάλιξ	small stone, pebble; gravel, rubble