Plain English Meaning
It is the part of a lesson where the instructor shows the student how to do something correctly, step by step, before the student tries it.
Full Definition
The stage of the demonstration-performance teaching method in which the instructor performs a skill or procedure exactly as the student is expected to perform it, while explaining what is being done and why. It follows the explanation phase and precedes the student's own attempt.
Context Anchor
Seen in flight instructor training and lesson planning, especially when teaching cockpit procedures, maneuvers, landings, preflight tasks, or emergency procedures.
Derivation
From Latin demonstrare, meaning 'to show clearly.' The instructor's job in this phase is exactly that — to show the skill clearly so the student has an to copy.