Plain English Meaning
A standard fixed-wing airplane with a propeller out front (or on the wings), like the kind most student pilots learn to fly in.
Full Definition
A conventional fixed-wing airplane powered by one or more propellers driven by a piston or turbine engine, used as a general reference type when discussing handling characteristics common to most light training and general aviation aircraft.
Context Anchor
Seen in stall and spin explanations where the handbook is describing how a typical training airplane behaves near a stall.