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

From Science Daily • May 3, 2026

Their pace remained unchanged across all doses, but their paths became less winding at the lower and intermediate levels of caffeine.

From Science Daily • Apr. 18, 2026

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

From Science Daily • Apr. 18, 2026

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

From Science Daily • Apr. 18, 2026

The doctors had told him to lay off the caffeine, but he figured they’d make an exception for today.

From "Eleven" by Tom Rogers