Plain English Meaning
Coming out of a bank smoothly and evenly, taking off the same amount of bank each second, so the wings become level exactly when you want them to.
Full Definition
A rollout from a bank in which the airplane's bank angle is reduced at a steady, uniform rate so that wings-level attitude is reached at a planned, specific point — typically used in the second 90 degrees of a chandelle, where the pilot rolls out of the bank at a constant rate while the pitch attitude is held constant.
Context Anchor
Encountered while learning or practicing the chandelle, especially as the airplane is completing the second 90 degrees of the .