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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 though both sexes had similar levels of caffeine in their systems, females displayed much higher levels of impulsive behavior.

From Science Daily • Mar. 31, 2026

Kirkland Signature energy drinks mimic Celsius’s look, flavors, and 200 milligrams of caffeine, causing Celsius shares to fall.

From The Wall Street Journal • Mar. 25, 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

He was like an angry machine, shaking as if he’d just eaten those caffeine pills my mother used to take to stay skinny.

From "Please Ignore Vera Dietz" by A.S. King