/ˌkɒmpjʊˈteɪʃən/
[noun] The process of calculating or figuring out an answer, especially using mathematics or a computer. It can refer to a simple sum or to the complex work done by machines to solve difficult problems.
Before computers existed, 'computation' meant the very human act of thinking through sums — machines simply borrowed the word.
The story of 'computation' begins in ancient Rome, with the Latin verb 'putare', which originally meant 'to prune' or 'to clean' — specifically, to cut away the unnecessary parts of a tree or an account. From this physical act of clearing away came a mental one: to reckon, to settle, to think clearly. Romans combined 'putare' with the prefix 'com-' (meaning 'together' or 'thoroughly') to form 'computare', which meant to reckon up, to calculate, or to count all the pieces together. It was an accountant's word, a word that smelled of ledgers and market stalls.
From 'computare', Latin produced the noun 'computatio', meaning the act or result of reckoning. This word passed through the centuries largely unchanged in form, moving into Old French as 'computation' and then crossing into English in the 15th century. Early English writers used it in contexts we would still recognise: calculating dates, counting money, working out the movements of stars. The word carried a serious, scholarly weight — it belonged to astronomers and churchmen trying to fix the date of Easter as much as to merchants balancing their books.
For most of its life in English, 'computation' described human mental effort. To compute was something a person did with a quill, a counting board, or eventually a slide rule. The word gathered dignity over the centuries precisely because careful reckoning was difficult and valued. In the 17th and 18th centuries, teams of human workers — often called 'computers' themselves — would sit together performing long chains of arithmetic to produce astronomical tables or navigation charts. The noun 'computer' originally referred to these people, not to any machine.
The arrival of electronic calculating machines in the mid-20th century did not replace the word — it simply redirected it. When engineers and mathematicians built the first programmable computers in the 1940s, they naturally reached for the existing vocabulary of human reckoning. 'Computation' and 'compute' slid smoothly from describing what a person did to describing what a machine did. This transfer was so complete that most people today are surprised to learn the words are far older than any silicon chip.
The Latin root 'putare' has been extraordinarily generous to the English language. Through different routes and combinations, it gave us 'count' (via Latin 'computare' → Old French 'conter' → Middle English 'counten'), 'account' (via Latin 'computare' → Old French 'aconter' → Middle English 'accounten'), 'discount', 'recount', and 'deputy' (via Latin 'deputare', meaning to assign or allot). Even the word 'reputation' shares this ancestry — via Latin 'reputare', meaning to think over again — reminding us that a good name is built by the careful reckoning of others. Every time we count, account for our actions, or defend our reputation, we are unknowingly reaching back to a Roman man trimming branches in an orchard.