/daɪˈvɜːrt/
[verb] To change the direction that something is going, or to take someone's attention away from what they are focused on. It can also mean to entertain or amuse someone.
The same Latin root that gives us 'divert' also secretly lives inside the word 'divorce' — both share the idea of turning away.
At the heart of 'divert' is a beautifully simple Latin idea: turning away. The word comes from the Latin 'divertere', built from two pieces — the prefix 'di-' (a form of 'dis-', meaning 'apart' or 'away') and 'vertere', meaning 'to turn'. Put them together and you get the vivid image of something being spun off in a different direction, pulled away from its original path.
The root 'vertere' is one of the great workhorses of Latin, and it seeded an enormous family of English words. Through Old French and Middle English, 'vertere' gave us 'convert' (Latin convertere → Old French convertir → Middle English converten), meaning to turn something into something else. It gave us 'revert' (Latin revertere → Old French revertir → Middle English reverten), to turn back. And it gave us 'invert' (Latin invertere → Old French invertir → Middle English inverten), to turn upside down. Each one follows the same chain: a Latin compound travels through Old French before arriving in English.
The word 'divertere' itself passed into Old French as 'divertir', where it was used to mean both changing physical direction and, more playfully, entertaining or amusing someone — as if turning their thoughts away from serious matters. This double meaning is key. By the time English borrowed 'divert' in the 15th century, both senses came with it: the practical sense of redirecting something (a river, a road, traffic) and the social sense of providing amusement or distraction.
That second, lighter meaning gave rise to the noun 'diversion', which by the 17th and 18th centuries had become a fashionable word for a pastime or entertainment. The French word 'divertissement' — drawn directly from the same root — became a term used in ballet and theatre for a short, light performance piece, a little detour of pure pleasure within a larger show. The word arrived in English from French in exactly this form: French 'divertissement' → English 'divertissement'.
The more surprising relative hiding in this family is 'divorce'. It comes from Latin 'divortium', itself derived from 'divertere' — because a divorce, in the Roman legal mind, was quite literally the act of turning apart, of two lives going in separate directions. Latin 'divortium' → Old French 'divorce' → Middle English 'divorce'. That a traffic diversion and a legal dissolution of marriage share the same ancient root reveals just how concretely the Romans thought about abstract human experiences — always in terms of physical movement, of paths and turning points.