'concur' originates from Latin, specifically the word 'concurrere', where 'con-' meant 'together' and 'currere' meant 'to run'.

'concur' changed from Late Latin and Old French forms such as 'concurrere' and 'concurrer' and eventually became the modern English word 'concur' through Middle English.

Initially, it meant 'to run together; come together', but over time it evolved into its current meanings of 'to agree' and 'to occur at the same time'.