| Noun | 1. | inertial guidance system - a system to control a plane or spacecraft; uses inertial forces robot pilot, automatic pilot, autopilot - a navigational device that automatically keeps ships or planes or spacecraft on a steady course ballistic capsule, space vehicle, spacecraft - a craft capable of traveling in outer space; technically, a satellite around the sun system - instrumentality that combines interrelated interacting artifacts designed to work as a coherent entity; "he bought a new stereo system"; "the system consists of a motor and a small computer" |