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caffeine

caffeine

Noun

This term refers specifically to the chemical stimulant, carrying a clinical and biological connotation. It is typically used in contexts involving nutrition, pharmacology, or daily habits, often associated with alertness, energy, or jitteriness.

As a mass noun representing a chemical substance, it is uncountable. To refer to specific quantities or types of the stimulant, speakers must use partitive constructions such as a dose of caffeine or a high level of caffeine.

Meanings

Nouncaffeine

A bitter alkaloid found in coffee beans, tea leaves, and cocoa beans that acts as a central nervous system stimulant.

The high caffeine content in the espresso kept him awake all night.

Examples

I need some caffeine.

Coffee has caffeine.

Too much caffeine hurts.

I drank too much caffeine today.

Does this tea contain caffeine?

She avoids caffeine before bed.

I cannot focus at the office without caffeine.

Office

The doctor advised me to reduce my caffeine intake.

Health

Some energy drinks have an excessive amount of caffeine.

Gourmet

Caffeine acts as a central nervous system stimulant.

Trivia

The company is developing a caffeine free alternative.

Business

Historical records show how caffeine spread across Europe.

History

Last Updated: May 2026•Report an Error