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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.

It's less bitter than green tea, with a low caffeine content - and it's creeping onto café menus.

From BBC • May 8, 2026

"I think mate is gonna be the next thing," says Adam Leahy, 23, highlighting its taste and high caffeine content.

From BBC • May 8, 2026

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

This finding suggests that compounds other than caffeine, such as polyphenols, may be responsible for certain cognitive benefits.

From Science Daily • May 3, 2026

And I can't help but think: maybe Tiny Cooper should fry his brain with caffeine more often.

From "Will Grayson, Will Grayson" by John Green and David Levithan