(often initial capital letters)U.S. Aerospace. the portion of the Apollo spacecraft that contained the crew's living compartment and the on-board controls.
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British Dictionary definitions for command module
the cone-shaped module used as the living quarters in an Apollo spacecraft and functioning as the splashdown vehicle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012