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encyclopaedia (n.)

see encyclopedia. The Latin spelling survives as a variant because many of the most prominent ones (such as Britannica) have Latin names.

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Definitions of encyclopaedia from WordNet

encyclopaedia (n.)
a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty;
Synonyms: encyclopedia / cyclopedia / cyclopaedia
From wordnet.princeton.edu