'introvert' originates from Latin, specifically the word 'introvertere,' where 'intro-' meant 'inward' and 'vertere' meant 'to turn.'

'introvertere' transformed into the French word 'introvertir,' and eventually became the modern English word 'introvert' through Middle English.

Initially, it meant 'to turn inward,' and over time it evolved into its current meaning of 'a person who is inwardly focused.'