Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “insomnia”

insomnia

noun [U]     /ɪnˈsɒm.ni.ə/ US  /-ˈsɑːm-/
C2 the condition of being unable to sleep, over a period of time: Holly suffered from insomnia caused by stress at work.Not sleeping and not unconscious
(Definition of insomnia noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of insomnia

Definitions of “insomnia” in other dictionaries

Word of the Day

friendship

a situation in which two people are friends

Word of the Day

Blog

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