(physics) of an elementary particle, or the equivalent electromagnetic radiation, having an energy greater than a hundred thousand electron volts

(physics) The energy possessed by an object because of its motion, equal (nonrelativistically) to one half the mass of the body times the square of its speed.

The energy possessed by an object because of its position (in a gravitational or electric field), or its condition (as a stretched or compressed spring, as a chemical reactant, or by having rest mass).

(physics) Any of the discrete stable energies that a quantum mechanical system (such as the electrons of an atom) can have. / Used other than figuratively or idiomatically: see energy, level.

(chemistry) The net potential energy liberated or absorbed during the course of a chemical reaction

(physics) A property, characteristic of the state of a thermodynamic system, the change of which is equal to the heat absorbed minus the work done by the system.

heat under the ground used to heat water and make steam to turn generator turbines and make electricity.

(physics) The energy needed to separate the constituent parts of an atom or nucleus; equivalent to the mass defect.

(physics) The energy released by a nuclear reaction; either through nuclear fission or nuclear fusion / Such energy used as a power source.

Energy in the form of electromagnetic radiation emitted from the Sun; especially that part of this energy that is converted into usable thermal or electrical energy by man.