'formal' originates from Latin, specifically the word 'formalis,' where 'forma' meant 'form or shape.'

'formalis' transformed into the Old French word 'formel,' and eventually became the modern English word 'formal' through Middle English.

Initially, it meant 'pertaining to form or shape,' but over time it evolved into its current meaning of 'relating to outward form or structure, often in a ceremonial or official context.'