live load

n.
A moving, variable weight added to the dead load or intrinsic weight of a structure or vehicle.

The moving or movable external load on a structure; includes the weight of furnishings of a building, of the people, of equipment, etc., but does not include wind load.

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The noun has one meaning:

Meaning #1: a variable load on a structure (e.g. a bridge) such as moving traffic
  Synonym: superload

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