battalionEnglishOxford American Thesaurusbattalion noun 1 an infantry battalion: unit, regiment, brigade, force, garrison, division, squadron, squad, company, section, detachment, contingent, legion, corps, troop, group; in ancient Rome cohort. 2 a battalion of women promoting the latest perfumes: crowd, army, mob, throng, horde, swarm, multitude, herd, host, mass, drove, large number.