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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

propagation
the movement of a wave through a medium

noun.phenomenon

3 Subcategories

Doppler effect, Doppler shift go
change in the apparent frequency of a wave as observer and source move toward or away from each other
red shift, redshift go
(astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum)
wave front go
all the points just reached by a wave as it propagates