Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “nitrogen”


noun [U]    /ˈnɑɪ·trə·dʒən/
biology, chemistry a gas , one of the chemical elements , that has no color or taste , is a part of all living things, and forms about 78 percent of the earth’s atmosphere (= mixture of gases surrounding it)
(Definition of nitrogen noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of nitrogen

More American English definitions for “nitrogen”

Definitions of “nitrogen” in other dictionaries

Word of the Day

prenuptial agreement

an official document signed by two people before they get married that says what will happen to their possessions and/or children if they divorce (= officially stop being married)

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More