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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
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physical entity go
an entity that has physical existence
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process, physical process go
a sustained phenomenon or one marked by gradual changes through a series of states
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phenomenon go
any state or process known through the senses rather than by intuition or reasoning
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natural phenomenon go
all phenomena that are not artificial
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physical phenomenon go
a natural phenomenon involving the physical properties of matter and energy
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energy, free energy go
(physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work
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radiation go
energy that is radiated or transmitted in the form of rays or waves or particles
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electromagnetic radiation, electromagnetic wave, nonparticulate radiation go
radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge
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radio wave, radio emission, radio radiation go
an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m
sky wave
a radio wave that is reflected back to earth by the ionosphere or a communications satellite
noun.phenomenon

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