a large group of soldiers, especially in ancient Rome.——朗文当代大辞典

Roman History. A body of infantry in the Roman army, ranging in number from 3,000 to 6,000 (at the time of Marius), and usually combined with many cavalry.——牛津当代大辞典

An armed host; (a part of) an army.——牛津当代大辞典

Any of various (esp. Continental) military bodies of modern times.——牛津当代大辞典  @en