What does cyclopedia mean?
A cyclopedia is a comprehensive reference work that assembles knowledge across many fields of study into a single volume or set of volumes. It is essentially an older name for what we now call an encyclopedia, and the two words are true synonyms differing mainly in period and fashion rather than meaning. The term flourished from the eighteenth through the nineteenth centuries — Ephraim Chambers's Cyclopaedia of 1728 was among the most influential early works of its kind — but it has since fallen out of everyday use. Today, cyclopedia survives chiefly in the titles of historical publications, such as Chambers's Cyclopaedia or the American Cyclopaedia, and in scholarly discussions of the history of reference publishing. A related variant spelling, cyclopaedia, appears especially in British texts. For modern readers, encountering the word usually signals that a book belongs to an earlier era of print scholarship, lending it a slightly antiquarian charm.
nounA cyclopedia is a comprehensive reference work containing articles or entries on a wide range of subjects; it is an older, now largely historical term for what would today be called an encyclopedia.
- A comprehensive reference work covering all branches of knowledge (an older term for an encyclopedia).
"The library's oldest cyclopedia, published in 1852, still occupied its own reading stand."
"He spent the afternoon browsing a battered nineteenth-century cyclopedia in search of forgotten trades."
"The New American Cyclopaedia of the 1860s was regarded as the most scholarly cyclopedia produced in the United States at the time."
The plural follows standard noun formation. Variant spellings such as cyclopaedias occur in British contexts.
"The rare-books room holds several nineteenth-century cyclopedias."
"Cyclopedia" was once the go-to word for the encyclopedia itself — Chambers's pioneering 1728 Cyclopaedia helped launch the whole genre before the modern spelling took over.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does cyclopedia come from?
The word derives from Greek roots transmitted through French: the element "cycle" comes from Greek kyklos, meaning circle or wheel, while the second element reflects Greek paideia, meaning education or rearing of children. It entered English in the early eighteenth century, popularized by works such as Ephraim Chambers's Cyclopaedia (1728). Related terms sharing this heritage include cycle, cyclical, and the broader adjective encyclopedic.
Related word forms
How cyclopedia is actually used
Cyclopedia is now largely archaic or historical in register; it survives mainly in the titles of older reference works and in discussions of publishing history. The variant spelling cyclopaedia also appears, especially in British sources. In contemporary usage, encyclopedia has almost entirely replaced it.
Easily confused with cyclopedia
An encyclopedia is the standard modern term for a comprehensive reference work, while cyclopedia is an earlier and now chiefly historical synonym for the same kind of book.