'instinct' originates from Latin, specifically the word 'instinctus,' where 'in-' meant 'into' and 'stinguere' meant 'to prick or incite.'

'instinctus' transformed into the Old French word 'instinct,' and eventually became the modern English word 'instinct' through Middle English.

Initially, it meant 'an incitement or impulse,' but over time it evolved into its current meaning of 'an innate behavior or tendency.'