theater of operations(n = noun.location) field, field of operations, theater, theatre, theatre of operations - a region in which active military operations are in progress; "the army was in the field awaiting action"; "he served in the Vietnam theater for three years"
is a kind of region
is a part of theater of war, theatre of war
has parts: combat area, combat zone

N  warfare, fighting, hostilities, war, arms, the sword, Mars, Bellona, grim visaged war, horrida bella, bloodshed, appeal to arms, appeal to the sword, ordeal of battle, wager of battle, ultima ratio regum, arbitrament of the sword, battle array, campaign, crusade, expedition, operations, mobilization, state of siege, battlefield, theater of operations, warpath, art of war, tactics, strategy, castrametation, generalship, soldiership, logistics, military evolutions, ballistics, gunnery, chivalry, gunpowder, shot, battle, tug of war, service, campaigning, active service, tented field, kriegspiel, Kriegsspiel, fire cross, trumpet, clarion, bugle, pibroch, slogan, war-cry, war-whoop, battle cry, beat of drum, rappel, tom-tom, calumet of war, word of command, password, watchword, passage d-armes, war to the death, war to the knife, guerre a mort, guerre a outrance, open war, internecine war, civil war, contending, contentious, armed, armed to the teeth, armed cap-a-pie, sword in hand, in arms, under arms, up in arms, at war with, bristling with arms, in battle array, in open arms, in the field, embattled, battled, unpacific, unpeaceful, belligerent, combative, armigerous, bellicose, martial, warlike, military, militant, soldier-like, soldierly, chivalrous, strategical, internecine, flagrante bello, in the thick of the fray, in the cannon's mouth, at the sword's point, at the point of the bayonet, Int, vae victis!, to arms!, to your tents O Israel!, the battle rages, a la guerre comme a la guerre, bis peccare in bello non licet, jus gladii, my voice is still for war, 'tis well that war is so terrible, otherwise we might grow fond of it, my sentence is for open war, pride, pomp, and circumstance of glorious war, the cannons have their bowels full of wrath, the cannons aspit forth their iron indignation, the fire-eyed maid of smoky war, silent leges inter arma, si vis pacem para bellum.

arena theater, base of operations, chemical operations, dinner theater, field of operations, guerrilla theater, home theater, little theater, military operations, million floating point operations per second, movie theater, musical theater, operating theater, operations, operations research, street theater, theater, theater company, theater critic, theater curtain, theater director, theater in the round, theater light, theater of the absurd, theater of war, theater prompter, theater stage, theater ticket, theatre of operations, trading operations, trillion floating point operations per second, vaudeville theater