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Definition of Fortune 500
1. Noun. (singulare tantum) The list published annually by w:Fortune (magazine) ''Fortune'' magazine, numbering five hundred, of the highest-revenue United States companies. ¹
2. Noun. (plurale tantum) Collectively, the members of that list. ¹
3. Noun. (by extension informal countable) Any one member of that list. ¹
¹ Source: wiktionary.com