Webster's English Dictionary

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encyclopedia

en.cy.clo.pe.dia \in-.si--kl*-'pe-d-e--*\ n [ML encyclopaedia course of 
   general education, Gk enkyklios paideia] general education : a work that 
   contains information on all branches of knowledge or treats  
   comprehensively a particular branch of knowledge usu. in articles arranged 
   alphabetically by subject