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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.

Researchers say there are several reasons why very high caffeine intake may stop being beneficial.

From Science Daily • May 13, 2026

These neurotransmitters naturally become less active with age and in diseases like Alzheimer's, so caffeine may help counteract that decline.

From Science Daily • May 13, 2026

Researchers also caution that measuring caffeine intake by "cups" is not exact.

From Science Daily • May 13, 2026

Excessive caffeine can also interfere with sleep and increase anxiety, both of which may negatively affect brain health.

From Science Daily • May 13, 2026

I had been cultivating a headache for the last few hours—the kind of headache that felt like it was going to pop my eyes right out of my skull—and caffeine usually helped.

From "Darius the Great Is Not Okay" by Adib Khorram