Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “invalid”

invalid

adjective
 
 
/ɪnˈvælɪd/
LAW not legally or officially acceptable: an invalid document/passport/licencebe declared/deemed/ruled invalid Insurance is ruled invalid if the report is not received within 30 days of the theft.
not correct, or not based on correct information: A small number of messages bounced back from invalid e-mail accounts.
IT not recognized or accepted by a computer: invalid data
→ Compare valid
(Definition of invalid from the Cambridge Business English Dictionary © Cambridge University Press)
What is the pronunciation of invalid?
Add Cambridge dictionaries to your browser to your website

Definitions of “invalid” in other dictionaries

Word of the Day

bitter

a type of dark brown beer with a bitter taste

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