1. very large numbers of people or things
Usage: plural form
2. large military units in ancient Rome, typically consisting of 3,000 to 6,000 soldiers
Usage: historical; plural form

Examples

• Legions of fans waited outside the concert hall.
• The Roman legions conquered much of Europe.
• There are legions of reasons why this plan won’t work.
• Caesar commanded several legions during his campaigns in Gaul.
• Legions of volunteers helped clean up after the disaster.
• The ancient legions were known for their discipline and organization.
• She has legions of followers on social media.