|reference frame (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. |a gadget; dingus; thingumbob.| |a
stew of meat, vegetables, potatoes, etc.|