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Definitions

caffeine

[ka-feen, kaf-een, kaf-ee-in] / kæˈfin, ˈkæf in, ˈkæf i ɪn /


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.

The findings may have broader implications for people who rely on caffeine at night, including shift workers, health care professionals, and military personnel.

From Science Daily • Mar. 31, 2026

Scientists found that consuming caffeine at night can increase impulsive behavior, raising the likelihood of risky or uncontrolled actions.

From Science Daily • Mar. 31, 2026

Both brands’ 12-ounce cans carry the same 200 milligrams of caffeine, too.

From The Wall Street Journal • Mar. 25, 2026

Kirkland Signature energy drinks mimic Celsius’s look, flavors, and 200 milligrams of caffeine, causing Celsius shares to fall.

From The Wall Street Journal • Mar. 25, 2026

Between the quick-decaying rush of excitement from seeing Amelia for the first time and the caffeine making his head spin, he was glad to be sitting.

From "The Serpent King" by Jeff Zentner