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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.

This suggests caffeine improves their ability to learn and remember locations.

From Science Daily • Apr. 18, 2026

For ants exposed to 25 ppm of caffeine, foraging time decreased by 28 percent with each visit.

From Science Daily • Apr. 18, 2026

The highest caffeine level did not produce the same benefit.

From Science Daily • Apr. 18, 2026

The people who gather in this small room on the eighth floor of the New York Stock Exchange look like a group of middle-aged caffeine addicts.

From The Wall Street Journal • Apr. 15, 2026

Yaupon holly was the only plant indigenous to this land that contained caffeine.

From "Legendary Frybread Drive-In" by Cynthia Leitich Smith