Plain English Meaning
How fast the airplane is going up, measured in feet per minute.
Full Definition
The vertical speed at which an aircraft is gaining altitude, expressed in feet per minute (fpm). It is shown on the vertical speed indicator and depends on excess power available beyond what is needed for level flight at a given airspeed.
Context Anchor
Seen in aircraft performance charts, climb procedures, and cockpit instruments that show upward or downward movement.
Why Pilots Care
It shows whether the aircraft can and safely and efficiently.