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

noun.phenomenon

6 Subcategories

allotropy, allotropism go
the phenomenon of an element existing in two or more physical forms
exchange go
chemical process in which one atom or ion or group changes places with another
crystallization, crystallisation, crystallizing go
the formation of crystals
valency go
the phenomenon of forming chemical bonds
pleomorphism, polymorphism go
(chemistry) the existence of different kinds of crystal of the same chemical compound
state, state of matter go
(chemistry) the three traditional states of matter are solids (fixed shape and volume) and liquids (fixed volume and shaped by the container) and gases (filling the container)