/əˈvɛndʒ/
[verb] To hurt or punish someone who has done something wrong to you or to another person, as a way of getting justice or fairness.
Avenge and revenge share the same Latin root, yet for 700 years English speakers have treated them as morally opposite acts.
The story of 'avenge' begins in Latin, with the verb 'vindicare', meaning to lay claim to something, to set free, or to punish. This powerful word carried the idea of asserting a right — the sense that justice is something you reach out and grab. From 'vindicare' came the Latin noun 'vindicta', meaning revenge or vengeance, and the whole family of words circled around the idea that wrongdoing creates a kind of debt that must be paid.
As Latin evolved into Old French, 'vindicare' split and transformed. One branch became 'venger' in Old French, meaning to punish or take revenge. The prefix 'a-' was added — from the Latin 'ad-', meaning 'to' or 'toward' — creating 'avengier', which carried the sense of moving toward punishment, of actively pursuing justice. This form crossed the English Channel and entered Middle English around the late 14th century as 'avenge', appearing in texts and chronicles of that period with the same sharp moral energy it carries today.
What makes 'avenge' particularly interesting is how English speakers slowly, almost instinctively, drew a distinction between 'avenge' and 'revenge', two words born from essentially the same root. Old French 'avengier' gave English 'avenge', while Old French 'revengier' — built with the prefix 're-', meaning 'back' — gave English 'revenge'. Both describe the same act of retaliation, yet writers began treating them differently. To 'avenge' came to suggest a righteous, justified punishment carried out on behalf of someone else or in the name of justice. To 'revenge', by contrast, suggested something more personal, more driven by anger and self-interest.
This moral split is fascinating because it was never formally decided — no grammarian sat down and declared the rule. It emerged organically from literary use, especially in poetry and drama. Writers like Chaucer and later Shakespeare instinctively reached for 'avenge' when a hero punished a villain on behalf of an innocent victim, and for 'revenge' when a character was consumed by bitter personal hatred. The distinction was felt rather than argued, and it stuck.
The deeper Latin root, 'vindicare', went on to produce a remarkable number of English words through different paths. Latin 'vindicare' → Old French 'vengier' → English 'vengeance'. Latin 'vindicta' → English 'vindictive'. Latin 'vindicare' itself → English 'vindicate', meaning to clear someone of blame — almost the mirror image of punishment, yet from the same source. Even the word 'vanquish', through a different Old French route, is a distant cousin. The root idea of claiming, asserting, and settling accounts runs through all of them like a thread.
Today 'avenge' remains a word with a heroic flavour. It fills the titles of films and the pages of fantasy novels. When someone says 'I will avenge you', there is an echo of something ancient — a promise reaching back through French courts and Roman law all the way to the earliest human sense that wrong deeds must be answered, and that justice is not passive but something that must be actively, purposefully pursued.