Wiktionary
n. (context mathematics physics English) A coordinate system (or a frame of reference) defined with respect to the distant stars, whose relative positions do not change over reasonably long periods of time
Usage examples of "inertial space".
But the readouts that tell him his absolute position in inertial space should be working, because they're working in our own suits.
Since our position sensors insist that we are at rest in inertial space, the only explanation is that the ship itself resides in a field of force, albeit a very weak one—.
And as Michel spoke he could feel a small though abrupt change in the inertial space his body occupied.
There was the usual moment of disorientation as his stomach came up to meet his throat, and then the giddiness of a rotation and realignment of the ship in inertial space.