IPA: /ˌɛrəˈnɔtɪks/
KK: /ˌɛrəˈnɔtɪks/
The study and practice of designing, building, and operating aircraft.
He studied aeronautics to become a pilot and engineer.
Aeronautics is formed from "aero-" (from Greek "aēr", meaning air) and "nautics" (from Greek "nautikos", meaning relating to ships or navigation). The word refers to the science or practice of flight in the air, particularly involving aircraft.
Think of 'air' ('aero-') and 'navigation' ('nautics') to remember that aeronautics is all about navigating through the air.