/ɪmˈpjuːt/
[verb] To say or believe that someone is responsible for something, especially something bad; to attribute a quality, action, or fault to a person or thing.
At its heart, 'impute' means to put something into someone's account — like charging a crime to their moral ledger.
The word 'impute' travels to us from the Latin verb 'imputare', which was built from two parts: the prefix 'im-' (a form of 'in-', meaning 'into' or 'upon') and 'putare', a wonderfully versatile verb that meant 'to reckon', 'to calculate', or 'to think'. The image embedded in 'imputare' was essentially a bookkeeping one — to enter something into someone's account, to charge it to them. Roman accountants used 'putare' when they settled accounts and cleared debts, so to 'imputare' a thing to someone was to write it down against their name.
This Latin root 'putare' is one of the most productive seeds in the entire English language. From it, via Latin 'computare' (to reckon together), came Old French 'compter' and then English 'count' and 'compute'. The same root gave us 'reputation' (from Latin 'reputare', meaning to think over repeatedly — your reputation is what others have repeatedly reckoned you to be), and 'dispute' (from Latin 'disputare', to reckon apart, to argue out a calculation). Even the word 'amputate' shares the same ancestor: Latin 'amputare' meant to cut around and prune, blending 'am-' (around) with 'putare' in its sense of pruning or clearing away.
The word entered Middle English in the 15th century, borrowed directly from Latin 'imputare' or through its Old French form 'imputer'. English speakers of that era were well used to Latin's presence in legal, religious, and scholarly writing, and 'impute' fitted naturally into theological and legal discourse. In Christian theology, the concept of imputed righteousness — the idea that God credits a believer with Christ's goodness, placing it in their spiritual account — became one of the great battlegrounds of the Reformation. Martin Luther and his followers leaned heavily on this word to explain how sinners could be considered righteous before God.
Over the centuries, 'impute' gradually extended beyond bookkeeping and theology into everyday moral and social life. To impute a motive to someone, to impute blame, or to impute a crime came to mean charging them with it in the court of public opinion, not just in a ledger. The word carried with it a slight air of suspicion or accusation — one rarely imputes good qualities to someone; the word tends to follow wrongdoing or dark intentions like a shadow.
What makes 'impute' genuinely interesting is how it preserves the ancient metaphor of moral life as accounting. We still speak of someone having things 'to their credit' or 'to their account', of 'paying' for mistakes, and of 'debts' to society — and 'impute' is the verb that performs the original act of writing the charge down. It connects the spreadsheet to the courtroom to the confessional, reminding us that cultures have long imagined virtue and guilt as entries in a ledger that must, eventually, be balanced.