Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “encyclopedia”


noun [C] ( also UK encyclopaedia)     /ɪnˌsaɪkləˈpiːdiə/
a book or a set of books containing facts about a lot of subjectsReference books
(Definition of encyclopedia noun from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “encyclopedia” in other dictionaries

Word of the Day


friendly or helpful

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