legionEnglishOxford American Thesauruslegion noun 1 a Roman legion: brigade, regiment, battalion, company, troop, division, squadron, squad, platoon, contingent, unit, force, corps, garrison, section, group, detachment, commando, battery, band, outfit, cohort. 2 there were legions of photographers and TV cameras: horde, host, throng, multitude, crowd, drove, mass, mob, rabble, gang, swarm, flock, herd, body, pack, score, mountain, army, sea, abundance, profusion.adjective her fans, who are legion, will love it: numerous, countless, innumerable, incalculable, immeasurable, untold, endless, limitless, boundless, myriad, many, abundant, plentiful, thick on the ground; informal umpteen.