UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈkæfɪˌneɪtəd/US:USA pronunciation: respellingUSA pronunciation: respelling(kafə nā′tid)

WordReference Random House Unabridged Dictionary of American English © 2020
caf•fein•at•ed  (kafə nā′tid),USA pronunciation adj. 
  1. containing caffeine:a caffeinated soft drink.
  • caffeine + -ate1 + -ed2

Collins Concise English Dictionary © HarperCollins Publishers::
caffeinated /ˈkæfɪˌneɪtəd/ adj
  1. with no natural caffeine removed
  2. with added caffeine
  3. highly stimulated by caffeine

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