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| a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid |
| the attractive effect of matter on other matter; the region surrounding an astronomical body in which the force of gravitation is strong |
| base unit | |
| —n | |
| physics any of the fundamental units in a system of measurement. The base SI units are the metre, kilogram, second, ampere, kelvin, candela, and mole | |
base unit n.
Any of the fundamental units of length, mass, time, electric current, thermodynamic temperature, amount of substance, or luminous intensity in the International System of Units, consisting respectively of the meter, kilogram, second, ampere, kelvin, mole, and candela.