'coincide' originates from Medieval Latin, specifically the word 'coincidere,' where 'co-' meant 'together' and 'incidere' meant 'to fall upon.'

'coincidere' transformed into the French word 'coincider,' and eventually became the modern English word 'coincide' through Middle English.

Initially, it meant 'to fall upon together,' but over time it evolved into its current meaning of 'to occur at the same time or be in agreement.'