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Noun
1. inertial system; inertial frame of referencePhysics
Wikipedia definition
2. Inertial frame of referenceIn physics, an inertial frame of reference (also inertial reference frame or inertial frame or Galilean reference frame) is a frame of reference that describes time homogeneously and space homogeneously, isotropically, and in a time-independent manner. All inertial frames are in a state of constant, rectilinear motion with respect to one another; they are not accelerating in the sense that an accelerometer at rest in one would detect zero acceleration.
Read “Inertial frame of reference” on English Wikipedia
Read “慣性系” on Japanese Wikipedia
Read “Inertial frame of reference” on DBpedia

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