noun U.S. Military.
a planning or command unit within a division of the army.
Origin of battle group
First recorded in 1950–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a group of warships usu. consisting of at least one aircraft carrier, other surface ships, submarines, landing craft, etc
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