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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

optical phenomenon go
a physical phenomenon related to or involving light

parallax go
the apparent displacement of an object as seen from two different points that are not on a line with the object

geocentric parallax, diurnal parallax go
the parallax of a celestial body using two points on the surface of the earth as the earth rotates

solar parallax
the angle subtended by the mean equatorial radius of the Earth at a distance of one astronomical unit

noun.phenomenon

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