Definition
The orientation of an aircraft's axes relative to a fixed reference, usually the natural horizon. It describes the aircraft's pitch (nose up or down) and bank (wings level or tilted) at a given moment.
Plain English
How the aircraft is positioned in the air right now -- whether the nose is pointing up, down, or level, and whether the wings are level or tilted to one side.
Context Anchor
Pilots encounter aircraft attitude when learning basic aircraft control, using the outside horizon, and reading an attitude indicator in the cockpit.
Derivation
From the Italian 'attitudine,' meaning 'posture' or 'position of the body.' In aviation, it kept that original sense of physical posture -- the aircraft's posture in the sky -- rather than the modern everyday meaning of 'mental outlook.'
Why Pilots Care
Maintaining the correct attitude is the primary means of controlling airspeed, altitude, and flight path; an incorrect attitude is the direct cause of stalls, spins, and most loss-of-control events.
Analogy
Think of aircraft attitude as the airplane’s posture. Just as a person can stand upright, lean, or tilt, an airplane can hold different positions relative to the horizon.
Intuition Check
Do not read attitude here as someone’s mood or behavior. In aviation, aircraft attitude means the airplane’s physical orientation relative to the horizon.
Example Sentence 1
The instructor demonstrated a level cruise attitude, with the nose just below the horizon and the wings level.
Example Sentence 2
During the steep turn, the pilot held a constant bank angle to maintain the desired aircraft attitude throughout the maneuver.