/kæʃ/
[noun] A hidden store of things, such as food, weapons, or money, that someone has kept secret. In computing, it also refers to a place where a device stores data temporarily to help it work faster.
Every cache begins with hiding — the French verb 'cacher' meant 'to hide', and the word never forgot it.
The word 'cache' comes directly from the French noun 'cache', which means a hiding place. That noun was formed from the French verb 'cacher', meaning 'to hide' or 'to conceal'. French speakers built this verb from the Vulgar Latin 'coacticare', a word that meant 'to compress' or 'to press together' — suggesting the act of packing things tightly away. That Vulgar Latin form came from classical Latin 'coactare', meaning 'to constrain' or 'to force', which itself derived from 'cogere', a compound of 'co-' (together) and 'agere' (to drive or to do). So the full chain runs: Latin cogere → Latin coactare → Vulgar Latin coacticare → Old French cachier → French cacher → French cache → English cache.
English borrowed the word in the late 18th century, most likely through contact with French-speaking trappers and explorers in North America. These men used 'cache' to describe a hidden pit or concealed storage spot where they buried food, furs, or supplies to keep them safe from weather, theft, or wild animals while they moved through the wilderness. The word arrived in English already carrying this strong sense of deliberate concealment combined with the practical need to survive in remote places.
By the 19th century, 'cache' had settled into everyday English use, particularly in writing about exploration, wilderness survival, and military tactics. It appeared frequently in accounts of Arctic expeditions and frontier life, where hiding supplies was a genuine matter of life and death. The word kept its French pronunciation — /kæʃ/ — which is why it sounds nothing like the spelling might suggest to a native English eye, and why people sometimes mistakenly spell it as 'cachet', a different French borrowing with a completely separate meaning.
The 20th century brought a remarkable second life to the word. Computer scientists adopted 'cache' in the 1960s and 1970s to describe a small, fast storage area where a processor keeps frequently used data so it does not have to retrieve it from slower main memory every time. The logic was elegant: just as a wilderness explorer hides supplies nearby so they are easy to reach quickly, a computer hides certain data close to the processor for fast access. The metaphor was so fitting that 'cache' became one of the most important words in all of computing, used in phrases like 'cache memory', 'browser cache', and 'cache hit'.
What is surprising about 'cache' is how its deepest meaning — the idea of pressing things together and putting them out of sight — has remained consistent across centuries and across wildly different contexts. Whether a French trapper burying dried meat beneath the snow or a web browser quietly storing images on your hard drive, the act described by 'cache' is always the same: something valuable, set aside in secret, ready to be retrieved when needed.