energy -
(physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs; "energy can take a wide variety of forms"
physical phenomenon a natural phenomenon involving the physical properties of matter and energy
natural philosophy,
physics the science of matter and energy and their interactions; "his favorite subject was physics"
activation energy,
energy of activation the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur; "catalysts are said to reduce the energy of activation during the transition phase of a reaction"
alternative energy energy derived from sources that do not use up natural resources or harm the environment
energy level,
energy state a definite stable energy that a physical system can have; used especially of the state of electrons in atoms or molecules; "according to quantum theory only certain energy levels are possible"
rest energy the energy equivalent to the mass of a particle at rest in an inertial frame of reference; equal to the rest mass times the square of the speed of light
work activity directed toward making or doing something; "she checked several points needing further work"
Energy (from Greek ἐνέργεια - energeia, "activity, operation", from ἐνεργός - energos, "active, working") is a quantity that is often understood as the ability to perform work. This quantity can be assigned to any particle, object, or system of objects as a consequence of its physical state. Different forms of energy include kinetic, potential, thermal, gravitational, sound, elastic and electromagnetic energy.
OmegaWiki Dictionary
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energy The capacity to do work; involving thermal energy (heat), radiant energy (light), kinetic energy (motion) or chemical energy; measured in joules.
energy A source of power, such as fuel and electrical energy, used for driving machines, providing light and heat, and powering electric devices.
