An Encyclopaedia also spelt as Encyclopedia or Encyclopædia is a compendium holding information of either a branch of knowledge or on all branches of knowledge. These are divided into articles which are usually accessed at the index either alphabetically by article name or by themes. Each article's subject is a single concept that is referred to y the article name unlike a dictionary. Encyclopedias have existed for around 2,000 years; the oldest still in existence, Naturalis Historia, was written in Roman times by Pliny the Elder. The modern encyclopedia evolved out of dictionaries around the 17th century. Historically, some encyclopedias were contained in one volume, but some, such as the Encylcopaedia Britannica, became huge multi-volume works. Some modern encyclopedias are electronic and are often freely available. The present day word of1530s, comes from Greek enkyklios paideia which literally means 'Training in a Circle' and is thought to be 'Course of Construction'.
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