military service mi·li·ta·ryservice uncommon noun 1. a force that is a branch of the armed forces Synonymsmilitary servicearmed serviceservice 2. land tenure by service in the lord''s army Synonymsmilitary service Related words Broader terms serviceforce Narrower terms armynavycoastguardair force Part of military unit WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.