Encyclopedia

What is Encyclopedia ?

Encyclopedia is , encyclopaedia (noun) 1. a reference book containing articles on all subjects of human knowledge, usually presented in alphabetical order If you need to know something about planets look up the ‘Astronomy’ article in the encyclopaedia. 2. a reference book containing articles on a single subject, arranged usually in alphabetical order a gardening encyclopedia the encyclopedia of sport

 

source: Easier English, Student Dictionary Upper Intermediate Level