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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

process, physical process go
a sustained phenomenon or one marked by gradual changes through a series of states

phenomenon go
any state or process known through the senses rather than by intuition or reasoning

natural phenomenon go
all phenomena that are not artificial

physical phenomenon go
a natural phenomenon involving the physical properties of matter and energy

energy, free energy go
(physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work

radiation go
energy that is radiated or transmitted in the form of rays or waves or particles

ionizing radiation
high-energy radiation capable of producing ionization in substances through which it passes

noun.phenomenon

5 Subcategories

alpha radiation, alpha ray go
the radiation of alpha particles during radioactive decay
beta radiation, beta ray, electron radiation go
radiation of beta particles during radioactive decay
cosmic ray go
highly penetrating ionizing radiation of extraterrestrial origin
neutron radiation go
radiation of neutrons (as by a neutron bomb)
X-radiation, X ray, X-ray, roentgen ray go
electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target