- In scientific usage, the product of the force of gravity, defined internationally as 9.80665 m/s2, times the mass of the body.
- In common usage, the apparent mass of a body when measured in air by comparison to standard masses of prescribed composition, the effects of the buoyancy of air being ignored.
- A piece of material, usually metal, of known mass, used as a comparison object in weighing.
- In statistics, a procedure to assign differential importance to certain observations at the expense of others, or a numerical factor employed in applying such a procedure.
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Examples: glitazone, GI cocktail, etc.