A system of equipment for automatically guiding the path of a vehicle (especially a missile)(noun)
WordNet. Princeton University. 2010.
Use "guidance system" in a sentence
"His bittersweet mission was to guide and watch over the Command Service Module whose power and guidance system provided the only means of getting home, and it still does."
"At 240,000 feet and Mach 24.9 the guidance system commandedAtlantis into a 75-degree right bank."
"The test compared data from the two systems during the flight to Kwaja-lein to select one as the guidance system for the Small ICBM (SICBM)."