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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

chemical phenomenon go
any natural phenomenon involving chemistry (as changes to atoms or molecules)

exchange go
chemical process in which one atom or ion or group changes places with another

photochemical exchange
an exchange produced by the chemical action of radiant energy (especially light)

noun.phenomenon

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