Plain English Meaning
Balance is about where the weight sits in the aircraft — front to back. If the combined weight of fuel, passengers, and cargo puts the aircraft's balance point inside the approved range, it will fly and handle as designed.
Full Definition
In aircraft loading, balance is the location of the center of gravity (CG) along the aircraft's longitudinal axis, expressed relative to the forward and aft limits set by the manufacturer. An aircraft is 'in balance' when the CG falls within those approved limits for the aircraft's weight and configuration.
Context Anchor
Seen during preflight planning when checking passengers, fuel, baggage, and cargo against the aircraft’s weight-and-balance limits.