inertial
Concise Oxford English Dictionary © 2008 Oxford University Press:
inertial/ɪˈnɜːʃl/
▶adjective
- 1 chiefly Physics relating to or arising from inertia.
- 2 (of navigation) depending on internal instruments which measure a craft's acceleration and compare the calculated position with stored data.
'inertial' also found in these Oxford entries:

