Usually means: Sum of divisors equals number.
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We found 17 dictionaries that define the word perfect number:

General (12 matching dictionaries)
  1. perfect number: Merriam-Webster
  2. perfect number: American Heritage Dictionary of the English Language
  3. perfect number: Collins English Dictionary
  4. perfect number: Wordnik
  5. perfect number: Wiktionary
  6. perfect number: The Wordsmyth English Dictionary-Thesaurus
  7. perfect number: Infoplease Dictionary
  8. perfect number: Dictionary.com
  9. Perfect Number (film), Perfect Number, Perfect number: Wikipedia, the Free Encyclopedia
  10. perfect number: Stammtisch Beau Fleuve Acronyms
  11. perfect number: FreeDictionary.org
  12. perfect number: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. perfect number: Encyclopedia

Science (4 matching dictionaries)
  1. A Glossary of Mathematical Terms (No longer online)
  2. Perfect Number: Eric Weisstein's World of Mathematics
  3. perfect number: PlanetMath Encyclopedia
  4. perfect number: Prime

Definitions from Wiktionary (perfect number)

noun:  (number theory) A number that is the sum of all of its divisors except itself.

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