Covering a wide range of subjects comprehensively; having the broad, detailed scope characteristic of an encyclopedia.
British English spelling from encyclopedia + -ic suffix. The Greek roots enkyklios ('circular, general') + paideia ('education') literally meant a 'complete education.' American English uses 'encyclopedic' without the 'a'.
When someone has 'encyclopaedic knowledge,' they're essentially claiming to have read an entire library—which in the Digital Age means Wikipedia might count!
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