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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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action, activity, natural process, natural action go
a process existing in or produced by nature (rather than by the intent of human beings)
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nuclear reaction go
(physics) a process that alters the energy or structure or composition of atomic nuclei
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disintegration, decay, radioactive decay go
the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
alpha decay
radioactive decay of an atomic nucleus that is accompanied by the emission of an alpha particle
noun.process

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