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Definitions

caffeine

[ka-feen, kaf-een, kaf-ee-in] / kæˈfin, ˈkæf in, ˈkæf i ɪn /


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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Lynch’s order included a chocolate milkshake and coffee, the cold sugar and caffeine fueling his ideas.

From Los Angeles Times Aug. 18, 2026

I enjoy breakfast food a lot, but if I want to have an eventful fun day, I need to just get the breakfast out of the way and get some caffeine in me.

From Los Angeles Times Aug. 14, 2026

Walk into most grocery stores or gyms, and you’ll find a wall of sleek cans with the caffeine of roughly three espresso shots, zero sugar and sans-serif pledges to accelerate metabolism.

From The Wall Street Journal Aug. 4, 2026

"These include caffeine, capsaicin, menthol and vanillin, not to mention the fact that many of the medicines we use today either come directly from plants or are inspired by plant chemistry."

From Science Daily Aug. 3, 2026

Judging from his dilated eyes and his maniacal grin, he didn’t need any more caffeine.

From "The House of Hades" by Rick Riordan




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