Encyclopedias have existed for around 2,000 years; the oldest still in existence, Naturalis Historia, was written in ca. 77 CE 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 Encyclopædia Britannica or the world´s largest Enciclopedia universal ilustrada europeo-americana, became huge multi-volume works. Some modern encyclopedias, such as Wikipedia, are electronic and are often freely available.

The word encyclopaedia comes from the Koine Greek ἐγκυκλοπαιδεία, from Greek ἐγκύκλιος παιδεία, transliterated enkyklios paideia, meaning "general education": enkyklios (ἐγκύκλιος), meaning "circular, recurrent, required regularly, general" + paideia (παιδεία), meaning "education, rearing of a child". but it was reduced to a single word due to an error by rinascimental copyists of Latin manuscripts. Together, the phrase literally translates as "complete instruction" or "complete knowledge".

Indeed, the purpose of an encyclopedia is to collect knowledge disseminated around the globe; to set forth its general system to the men with whom we live, and transmit it to those who will come after us, so that the work of preceding centuries will not become useless to the centuries to come; and so that our offspring, becoming better instructed, will at the same time become more virtuous and happy, and that we should not die without having rendered a service to the human race in the future years to come. — Diderot

Noun

encyclopedia (plural encyclopedias)

1. A comprehensive reference work with articles on a range of subjects.

   I only use the library for the encyclopedia, we’ve got most other books here.

The spelling encyclopedia is standard in American English, preferred in Canadian English, accepted in Australian and International English, and also very common in British English. It is more common than encyclopaedia, for example, in UK newspapers on Google News in 2009 by a 7:3 margin.

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