Large military units or armies, especially referring to Roman soldiers, or simply meaning a very large number of something.
From Latin 'legio,' which referred to a Roman military division of about 5,000 soldiers. The word entered English through French and has meant 'large group' since medieval times.
A Roman legion was incredibly organized—each soldier had a specific rank, role, and training—and the legions were so effective that Rome conquered most of the known world with just a few dozen of them stationed around the empire.
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