caffeine

US /kæˈfin, ˈkæfˌin, ˈkæfiɪn/

UK /ˈkæfi:n/

B2
n. (u.)Uncountable NounSubstance in coffee, etc. that keeps you awake
Almost everyone I know drinks something with caffeine in the morning to get the day started
n. (u.)Uncountable NounThe amount of caffeine in a substance.
This brand of coffee has a high caffeine content.
n. (u.)Uncountable NounCaffeine used as an additive to enhance alertness or flavor.
Some people are sensitive to caffeine as an additive in food.

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