What is inertial?

  • (adj): Of or relating to inertia.

Some articles on inertial:

Advanced Inertial Reference Sphere
... The Advanced Inertial Reference Sphere, or AIRS, is a highly accurate inertial guidance system designed for use in the LGM-118A Peacekeeper ICBM which was intended for precision nuclear strike against Soviet missile ...
Ludwig Lange - Biography
... Lange is known for inventing terms like inertial frame of reference and inertial time (1885), which were used by him instead of Newton's "absolute space and time" ... DiSalle describes Lange's definition in this way “ An inertial system is a coordinate system with respect to which three free particles, projected from a single point and moving in non-coplanar ... inertia then states that relative to any inertial system, any fourth free particle will move uniformly ...
Special Relativity (alternative Formulations)
... of relativity — The form of a physical law is the same in any inertial frame ... The speed of light is constant — In all inertial frames, the speed of light c is the same whether the light is emitted from a source at rest or in motion ... (Note this does not apply in non-inertial frames, indeed between accelerating frames the speed of light cannot be constant ...