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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.

Millions of TVs - and kettles being boiled for a half-time caffeine boost - along with fridges being opened and closed as people get cold drinks and snacks would cause surges, said Neso.

From BBC • Jun. 6, 2026

Afterward, caffeine was provided in drinking water for unrestricted consumption over a seven-day period.

From Science Daily • May 30, 2026

The findings, published in Neuropsychopharmacology, reveal how caffeine acts on a well-defined brain pathway involved in social memory, the ability to recognize and distinguish people we have encountered before.

From Science Daily • May 30, 2026

The NHS advised getting enough sleep, staying physically active and eating well to manage stress, along with avoiding lots of caffeine.

From BBC • May 29, 2026

For some reason sugar and caffeine always calmed down my hyperactive brain.

From "The Sea of Monsters" by Rick Riordan




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