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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

refraction
the change in direction of a propagating wave (light or sound) when passing from one medium to another

noun.phenomenon

1 Subcategories

double refraction, birefringence go
splitting a ray into two parallel rays polarized perpendicularly