1. the numbers from 1,000,000 to 9,999,999; very large quantities or amounts
Usage: plural form of million
2. very many people or things
Usage: informal; used for emphasis

Examples

• The company earned millions of dollars last year.
• Millions of people watched the championship game.
• There are millions of stars in the galaxy.
• The lottery jackpot was worth millions.
• Millions of books are published annually.
• The hurricane caused millions in damage.
• She has millions of followers on social media.