'instructor' originates from Latin, specifically the word 'instructor' (from the verb 'instruere'), where 'in-' meant 'into' and 'struere' meant 'to build or arrange'.

'instructor' changed from Late Latin 'instructor' and Old French 'instructeur' and eventually became the modern English word 'instructor' through Middle English.

Initially, it meant 'one who builds or arranges (or instructs)', but over time it evolved into its current meaning of 'a person who teaches or trains'.