reference-frame

reference frame

noun Physics.
frame of reference ( def 2 ).

Origin:
1920–25

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American Heritage
Science Dictionary
reference frame  [%PREMIUM_LINK%]     (rěf'ər-əns)  Pronunciation Key 
A basis of a four-dimensional coordinate system in which the first coordinate is understood as a time coordinate, while the other three coordinates represent spatial dimensions. Inertial frames and non-inertial frames are both examples of reference frames. Also called frame of reference. See also General Relativity, space-time, Special Relativity.

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