Usually means: Stimulant commonly found in coffee.
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We found 12 dictionaries that define the word caffein:

General (10 matching dictionaries)
  1. caffein: Collins English Dictionary
  2. caffein: Vocabulary.com
  3. Caffein, caffein: Wordnik
  4. caffein: Wiktionary
  5. caffein: Dictionary.com
  6. Caffein: Wikipedia, the Free Encyclopedia
  7. caffein: Rhymezone
  8. caffein: FreeDictionary.org
  9. caffein: Mnemonic Dictionary
  10. caffein: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. caffein: Encyclopedia

Medicine (1 matching dictionary)
  1. caffein: Medical dictionary

(Note: See caffeins as well.)

Definitions from Wiktionary (Caffein)

noun:  Alternative spelling of caffeine [An alkaloid, C₈H₁₀N₄O₂, found naturally in tea and coffee plants, which acts as a mild stimulant on the central nervous system.]

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