'define' originates from Latin, specifically the word 'definire', where 'de-' meant 'completely' and 'finire' meant 'to finish or limit'.

'definire' transformed into the Old French word 'definir', and eventually became the modern English word 'define' through Middle English.

Initially, it meant 'to set limits or boundaries', but over time it evolved into its current meaning of 'to explain the meaning of a word or concept'.