(sciences) A measure or unit to express an object's weight, which is directly proportional to its mass when the gravity is fixed (as commonly but imprecisely presumed on earth's surface.)

(physics) Former term for the more specific relative atomic mass.

Alternative spelling of molecular weight

(Britain) An allowance paid to staff of a national organization working in London to help offset the additional expense of living in the capital.

(of a value) calculated from selected discrete values over a specified time period

a system of units of weight/mass, mostly used for precious metals and gemstones, in which the pound contains 12 ounces which each contain 480 grains

(chemistry) The sum of the atomic weights of every atom in a molecule.

(chemistry) The atomic weight of an element or radical divided by its valence; the molecular weight of a compound divided by its combining power in a specific reaction.

(intransitive, weightlifting) To take part in weight training

(weightlifting) A form of physical exercise using weights to increase the strength and size of muscles by using exercises specific for each muscle group.