Plain English Meaning
These are the gentle left or right roll inputs the pilot makes with the control wheel or stick to keep the wings where they should be, based on what the flight display is showing.
Full Definition
Small, smooth inputs to the ailerons (the hinged surfaces on the trailing edge of each wing) used to control or correct the airplane's bank angle during instrument flying. In the context of starting the scan, aileron corrections are the precise, measured roll inputs a pilot uses to keep the wings level or to return to a desired bank angle as shown on the attitude indicator.