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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.

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

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

From Science Daily • May 3, 2026

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

From Science Daily • Apr. 18, 2026

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

From Science Daily • Apr. 18, 2026

He was too anxious for caffeine, so he grabbed a lemonade.

From "Anger Is a Gift" by Mark Oshiro