military (adj.)

mid-15c., militari, "pertaining to or befitting soldiers; used, done, or brought about by soldiers," from Old French militaire (14c.) and directly from Latin militaris "of soldiers or war, of military service, warlike," from miles (genitive militis) "soldier," a word of unknown origin.

Perhaps ultimately from Etruscan, or else meaning "one who marches in a troop," and thus connected to Sanskrit melah "assembly," Greek homilos "assembled crowd, throng." De Vaan writes, "It is tempting to connect mīlia [pl.] 'thousand(s)', hence *mīli-it- 'who goes with/by the thousand' ...." Related: Militarily. Old English had militisc, from Latin.

Military police is from 1827. Military age, at which one becomes liable to military service, is by 1737. Military-industrial complex was coined 1961 in the farewell speech of U.S. president Dwight D. Eisenhower.

military (n.)

"soldiers generally," 1757, from military (adj.); commonly only with the definite article. Earlier, "a military man" (1736).

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Definitions of military from WordNet
military (adj.)
of or relating to the study of the principles of warfare;
military law
military (adj.)
characteristic of or associated with soldiers or the military;
military uniforms
military (adj.)
associated with or performed by members of the armed services as contrasted with civilians;
military police
military (n.)
the military forces of a nation;
their military is the largest in the region
the military machine is the same one we faced in 1991 but now it is weaker
Synonyms: armed forces / armed services / military machine / war machine