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(Astronautics) a method of missile guidance in which internal equipment enables it to steer itself onto the target, as by sensing the target's heat radiation
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
A system by which a missile or torpedo steers itself towards a target by means of a self-contained mechanism which is activated by some distinguishing characteristics of the target. See also active homing guidance; passive homing guidance; semi-active homing guidance.
Dictionary of Military and Associated Terms. US Department of Defense 2005.