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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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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

I had recently told Mona, my older sister, about the caffeine liaison, and I instantly had regretted it as I glanced at her text.

From Los Angeles Times Aug. 7, 2026

Dr. Rekha Kumar, associate professor of clinical medicine at Weill Cornell Medicine, said most healthy adults can consume up to 400 mg of caffeine a day.

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

“I’ve been waiting to get into the Chat for a cup of coffee for fifteen minutes already. If I don’t get some caffeine soon, I might drop into one of those whaddyacallits. Comas.”

From "Bone Gap" by Laura Ruby




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