Term:weight
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1) weight: the vertical force exerted by a mass as a result of gravity
2) weight, free weight, exercising weight: sports equipment used in calisthenic exercises and weightlifting; it is not attached to anything and is raised and lowered by use of the hands and arms
3) weight, weightiness: the relative importance granted to something; “his opinion carries great weight”; “the progression implied an increasing weightiness of the items listed”
4) weight: an artifact that is heavy
5) weight: an oppressive feeling of heavy force; “bowed down by the weight of responsibility”
6) system of weights, weight: a system of units used to express the weight of something
7) weight unit, weight: a unit used to measure weight; “he placed two weights in the scale pan”
8) weight, weighting: (statistics) a coefficient assigned to elements of a frequency distribution in order to represent their relative importance
1) burden, burthen, weight, weight down: weight down with a load
2) slant, angle, weight: present with a bias; “He biased his presentation so as to please the share holders”
noun weight has 8 sense(s) (first 5 from tagged texts)
A spring scale measures the weight of an object.


SI unit  newton (N) 

Derivations from
other quantities 
W = m · g 
In science and engineering, the weight of an object is usually taken to be the force on the object due to gravity. Weight is a vector whose magnitude (a scalar quantity), often denoted by an italic letter W, is the product of the mass m of the object and the magnitude of the local gravitational acceleration g; thus: W = mg. The unit of measurement for weight is that of force, which in the International System of Units (SI) is the newton. For example, an object with a mass of one kilogram has a weight of about 9.8 newtons on the surface of the Earth, and about onesixth as much on the Moon. In this sense of weight, a body can be weightless only if it is far away (in principle infinitely far away) from any other mass. Although weight and mass are scientifically distinct quantities, the terms are often confused with each other in everyday use.
There is also a rival tradition within Newtonian physics and engineering which sees weight as that which is measured when one uses scales. There the weight is a measure of the magnitude of the reaction force exerted on a body. Typically, in measuring an object's weight, the object is placed on scales at rest with respect to the earth, but the definition can be extended to other states of motion. Thus, in a state of free fall, the weight would be zero. In this second sense of weight, terrestrial objects can be weightless. Ignoring air resistance, the famous apple falling from the tree, on its way to meet the ground near Isaac Newton, is weightless.
Further complications in elucidating the various concepts of weight have to do with the theory of relativity according to which gravity is modelled as a consequence of the curvature of spacetime. In the teaching community, a considerable debate has existed for over half a century on how to define weight for their students. The current situation is that a multiple set of concepts coexist and find use in their various contexts.