Trooper/ˈtruːpər/ Definition 1 of 3Pro Tip 1/3Military Context Used to describe low-ranking soldiers, especially in a cavalry or armored unit. The troopers were briefed on the upcoming mission. Pro Tip 2/3Historical Association Often associated with historical or traditional military units, not modern-day infantry. The ceremony featured troopers from the old cavalry regiment. Pro Tip 3/3Cultural Imagery May evoke images of classic warfare, horses, and traditional uniforms. Children admire the shiny helmets of the troopers during parades.