A book or set of books that contains information about many different subjects, like an encyclopedia.
From Greek 'kyklos' (circle) and 'paedia' (education), literally 'circular education' or 'all-around learning.' It entered English in the 16th century as a shortened form of 'encyclopedia.'
The original cyclopedia was meant to give you a complete circle of knowledge in one place—everything you needed to know about the world! Before the internet, owning a cyclopedia set was like having the world's information locked in your living room.
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