'aeronautical' originates from Greek, specifically the word 'aeronautikos,' where 'aero-' meant 'air' and 'nautikos' meant 'pertaining to ships or sailors.'

'aeronautikos' transformed into the French word 'aéronautique,' and eventually became the modern English word 'aeronautical' through Middle English.

Initially, it meant 'pertaining to air navigation,' but over time it evolved into its current meaning of 'relating to the science or practice of building or flying aircraft.'