Definition
The act of readjusting an aircraft's trim setting after a change in airspeed, power, configuration, or load so that the aircraft once again maintains the desired attitude with minimal or no control pressure from the pilot.
Plain English
Resetting the trim so the aircraft holds its new attitude on its own, without you having to keep pushing or pulling on the controls.
Context Anchor
Seen in flight control and trim tab discussions, and used in flight after changes such as leveling off, changing power, or changing speed.
Derivation
The prefix 're-' means 'again.' So retrimming simply means trimming again — adjusting the trim a second (or third, or fourth) time as conditions change.
Why Pilots Care
Reduces pilot workload and fatigue by restoring hands-off control after configuration changes.
Intuition Check
Retrimming does not mean the airplane is being flown for you. It means you are removing the steady push or pull needed after you have already set the airplane where you want it.
Example Sentence 1
After leveling off at cruise altitude and reducing power, the pilot retrimmed the aircraft to hold altitude hands-off.
Example Sentence 2
A sudden decrease in airspeed required retrimming to keep the wings level without constant yoke input.