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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

force go
(physics) the influence that produces a change in a physical quantity

propulsion go
a propelling force

reaction propulsion
propulsion that results from the ejection at high velocity of a mass of gas to which the vehicle reacts with an equal and opposite momentum

noun.phenomenon

2 Subcategories

jet propulsion go
propulsion by means of the discharge of a jet of fluid toward the rear
rocket propulsion go
reaction propulsion using stored oxygen for combustion