/rɪˈliːs/
[verb] To set someone or something free, or to allow something to be shared with the public. It can also mean to stop holding something tightly.
Every time you 'release' something, you are unknowingly untying a knot — the word's root literally means to loosen a leash.
The word 'release' traces its earliest roots to the Latin verb 'laxare', meaning to loosen, widen, or slacken. This came from the Latin adjective 'laxus', meaning loose or slack — the same root that would eventually give English the word 'lax' (meaning not strict) and 'relax', which travelled through Late Latin 'relaxare' → Old French 'relaxer' → English 'relax'. The core idea in all these words is the same: letting go of tension, loosening a grip.
From Latin 'laxare', the word evolved into Old French as 'relesser' or 'relaissier', which meant to let go, to hand back, or to give up a claim on something. This Old French form was built from the prefix 're-' (back or again) and 'laissier' (to let, to leave), which itself came from Latin 'laxare'. The prefix 're-' added a sense of returning something to its natural state — as if you were sending something back to where it belonged.
English borrowed the word in the early 14th century directly from this Old French 'relesser', initially spelling it 'relessen' or 'relese'. At first, its meaning was largely legal — to release someone from a debt, a contract, or a legal obligation. It was the language of courts and agreements, meaning to formally give up a claim or to let someone go from a binding duty. This legal flavour can still be heard today when we talk about signing a 'release form'.
Over the following centuries, the word broadened considerably. By the 15th and 16th centuries, 'release' was being used to describe freeing prisoners, letting go of physical objects, and even expressing emotional relief — the sense that something held tightly inside you had finally been let loose. This emotional dimension gave us phrases like 'a release of tension' or describing crying as 'an emotional release', ideas that would have been unfamiliar to the word's first English users.
The modern sense of 'releasing' a film, a book, or a piece of music is surprisingly recent, coming into widespread use in the 20th century. Here the metaphor is vivid: a creative work is imagined as something that has been held back, contained, and then finally let go into the world. The noun form, 'a release', meaning a new product made available to the public, followed naturally. In computing, 'a software release' carries exactly this same image — code that was once private and contained, now set free for everyone to use.