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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.

Sales of energy drinks and crafted sodas are booming as Americans look beyond coffee and tea to get their caffeine fix and treat themselves.

From The Wall Street Journal • Apr. 13, 2026

The findings may have broader implications for people who rely on caffeine at night, including shift workers, health care professionals, and military personnel.

From Science Daily • Mar. 31, 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

He was too anxious for caffeine, so he grabbed a lemonade.

From "Anger Is a Gift" by Mark Oshiro