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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.

In contrast, ants given low or moderate amounts of caffeine quickly became more efficient.

From Science Daily • Apr. 18, 2026

By helping ants learn bait locations more quickly and recruit more nestmates, caffeine could increase how effectively poison spreads through a colony before the ants detect it.

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

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

“I’ve been waiting to get into the Chat for a cup of coffee for fifteen minutes already. If I don’t get some caffeine soon, I might drop into one of those whaddyacallits. Comas.”

From "Bone Gap" by Laura Ruby