( BrE also -pae·dia ) / ɪnˌsaɪkləˈpiːdiə; NAmE / noun
a book or set of books giving information about all areas of knowledge or about different areas of one particular subject, usually arranged in alphabetical order; a similar collection of information on a CD-ROM
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WORD ORIGIN
mid 16th cent.: modern Latin , from pseudo-Greek enkuklopaideia for enkuklios paideia all-round education.