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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 people who gather in this small room on the eighth floor of the New York Stock Exchange look like a group of middle-aged caffeine addicts.

From The Wall Street Journal • Apr. 15, 2026

Flies that consumed caffeine during the day did not show the same pattern, indicating that the timing of caffeine intake plays a key role.

From Science Daily • Mar. 31, 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

Higher levels of caffeine intake did not appear to cause harm.

From Science Daily • Mar. 18, 2026

It was getting to the perfect stage of meltiness, where the sugar and caffeine came together in a glorious adrenaline spiral.

From "Far from the Tree" by Robin Benway