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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.

Coca-Cola HBC CCH 3.41%increase; green up pointing triangle reported organic sales growth led by blockbuster caffeine consumption.

From The Wall Street Journal • May 7, 2026

Only participants consuming caffeine experienced reduced anxiety along with better attention and alertness.

From Science Daily • May 3, 2026

He added: "Coffee is more than just caffeine -- it's a complex dietary factor that interacts with our gut microbes, our metabolism, and even our emotional well-being," said Professor Cryan.

From Science Daily • May 3, 2026

The findings suggest that caffeine could play a role in improving pest control strategies for Argentine ants.

From Science Daily • Apr. 18, 2026

Espresso, Dr. Gloss op said, has three times the caffeine of regular coffee.

From "Woe Is I" by Patricia T. O'Conner