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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.

These results suggest that coffee can enhance mood even without caffeine.

From Science Daily • May 3, 2026

There, they encountered a drop of sugar solution containing 0, 25 ppm, 250 ppm, or 2,000 ppm of caffeine.

From Science Daily • Apr. 18, 2026

Their pace remained unchanged across all doses, but their paths became less winding at the lower and intermediate levels of caffeine.

From Science Daily • Apr. 18, 2026

Ongoing studies are testing caffeine-enhanced bait in outdoor environments in Spain and examining how caffeine interacts with the poison itself.

From Science Daily • Apr. 18, 2026

Between the quick-decaying rush of excitement from seeing Amelia for the first time and the caffeine making his head spin, he was glad to be sitting.

From "The Serpent King" by Jeff Zentner