Plain English Meaning
A measure of how much something tries to twist or tip the airplane around a reference point. The heavier the item and the farther it sits from that point, the bigger the moment.
Full Definition
The turning effect produced by a force acting at a distance from a pivot point, calculated as force multiplied by the perpendicular distance (arm) from that point. In aircraft weight and balance, moment is the product of an item's weight and its arm, expressed in pound-inches.
Context Anchor
Seen in weight-and-balance calculations before flight, especially when adding passengers, fuel, baggage, or equipment.