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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.

"We found that caffeine can reverse these disruptions at both the molecular and behavioral levels. Its ability to do so suggests that caffeine's benefits may extend beyond simply helping us stay awake."

From Science Daily • May 30, 2026

The researchers also found that caffeine administered before sleep deprivation restored synaptic communication in the CA2 region and returned plasticity to normal levels.

From Science Daily • May 30, 2026

At the other end, robusta beans, known for their high levels of caffeine, are mass harvested by machines.

From BBC • May 28, 2026

Their cafes are not designed for seating, but for the rapid delivery of caffeine, ordered by apps.

From BBC • May 28, 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




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