en·cy·clo·pae·dia /ɪnˌsaɪkləˈpidiə/
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  En·cy·clo·pe·di·a, En·cy·clo·pæ·di·a  n.  [Formerly written encyclopædy and encyclopedy.] The full circle of arts and sciences; a comprehensive summary of knowledge, or of a branch of knowledge; esp., a work in which the various branches of science or art are discussed separately, and usually in alphabetical order; a cyclopedia.
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  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 [syn: encyclopedia,
            cyclopedia, cyclopaedia]