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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.

The people who gather in this small room on the eighth floor of the New York Stock Exchange look like a group of middle-aged caffeine addicts.

From The Wall Street Journal • Apr. 15, 2026

Even so, nectar contains other compounds, such as nicotine and caffeine, that are known to influence animal behavior.

From Science Daily • Mar. 25, 2026

It was a group powered by caffeine, Johnston said, and their coffee came in handy when they needed a liquid prop to do quick demos with the prototypes to test their absorbency.

From The Wall Street Journal • Mar. 20, 2026

“For the Baja Blast die-hard, infused with caffeine and a refreshing boost of citrus,” Taco Bell said in a news release, “these patches energize skin and deliver cooling hydration.”

From Los Angeles Times • Mar. 18, 2026

His senses tingled like he’d been injected with caffeine.

From "The Son of Neptune" by Rick Riordan