Plain English Meaning
The part of takeoff where the aircraft is still on the runway, speeding up, before the wheels leave the ground.
Full Definition
The phase of takeoff during which the aircraft accelerates along the runway from the start of the takeoff run until it lifts off the surface. Also called the ground run.
Context Anchor
You will see this term in tower instructions, takeoff clearances, accident reports, and runway performance discussions.
Derivation
‘Roll’ here describes the aircraft rolling along the runway on its wheels. The term simply names the rolling portion of the takeoff, before the aircraft becomes .