Definition
Not symmetrical. Describes a shape, force, or arrangement that is not the same on both sides of a center line or reference axis.
Plain English
One side is different from the other. The two halves do not match.
Context Anchor
Seen in discussions of aircraft control, engine power, wing shape, ice buildup, and loading.
Derivation
From the Greek 'a-' meaning 'not' and 'symmetria' meaning 'agreement in measure.' So 'asymmetrical' literally means 'not in matching measure' — the two sides don't balance or mirror each other.
Why Pilots Care
An engine failure creates asymmetrical thrust that yaws the aircraft and demands immediate rudder correction to stay on course.
Intuition Check
Asymmetrical does not automatically mean broken or dangerous. It means the two sides are not the same; whether that matters depends on what is unequal and how much.
Example Sentence 1
An asymmetrical airfoil has more curve on the upper surface than the lower surface, which helps generate lift even at low angles of attack.
Example Sentence 2
Asymmetrical loading during a sideslip requires the pilot to adjust aileron and rudder inputs.