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Definitions

caffeine

[ka-feen, kaf-een, kaf-ee-in] / kæˈfin, ˈkæf in, ˈkæf i ɪn /
NOUN
coffee
Synonyms
STRONGEST
cappuccino espresso
STRONG
brew decaf decoction demitasse ink java mocha mud perk
WEAK
battery acid café café au lait café noir forty weight hot stuff jamocha joe varnish remover

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.

Anyone with these conditions should discuss caffeine intake with their doctor.

From Science Daily • May 18, 2026

Genetics can also play a role in how much coffee people enjoy, influencing both caffeine metabolism and the brain's reward system.

From Science Daily • May 18, 2026

Regular coffee drinkers also tend to clear caffeine from the body more efficiently.

From Science Daily • May 18, 2026

Coffee and tea contain other compounds beyond caffeine that may benefit the brain as well.

From Science Daily • May 13, 2026

Or, what if a regular coffee drinker drives to work in the morning without his usual cup of caffeine?

From "A Deadly Wandering: A Mystery, a Landmark Investigation, and the Astonishing Science of Attention in the Digital Age" by Matt Richtel

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