What does compendium mean?
A compendium is a single, conveniently organized volume that brings together a broad range of information on a given subject, presenting it concisely yet comprehensively. Dictionaries, encyclopedias, field guides, and collections of essays are all frequently described as compendiums. The word carries connotations of authority and thoroughness — calling something a compendium implies that it gathers the essentials of a topic into one authoritative place, sparing the reader from consulting scattered sources. Beyond books, English speakers use the term figuratively: a musician's box set may be called a compendium of their career, or a busy market described as a compendium of regional foods. The word derives from the Latin verb compendere, meaning to weigh together, which also gave English such words as compensate, pension, and pendulum. Both the anglicized plural "compendiums" and the classical "compendia" are correct, with "compendia" favored in formal and scholarly contexts.
nounA collection of concise but comprehensive information on a particular subject or in a particular field, gathered together into a single volume or reference work.
- A single-volume collection of comprehensive information on a subject, such as a handbook or reference work.
- More broadly, any comprehensive collection or summary of things of a particular kind (e.g., 'a compendium of short stories').
"Her latest book is a compendium of folk remedies collected from across rural Europe."
"The library keeps a compendium of world myths and legends near the reference desk."
"The album is essentially a compendium of everything the band recorded in their first decade."
Both plurals are correct. "Compendiums" follows regular English patterns, while the Latinate "compendia" is more common in scholarly and academic writing.
"The archive houses several compendia of local history alongside newer compendiums compiled by volunteers."
"Compendium" comes straight from Latin — literally "that which is weighed together" — making it a cousin of "pension" and "pendulum."
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of compendium
Compendium comes directly from Latin, where it meant a saving of time or effort, derived from the verb compendere, "to weigh together," formed from com- ("together") plus pendere ("to weigh"). The same root produced English words such as compensate, pension, and pendulum, all involving weighing or paying out. The word entered English in the late 16th century, initially retaining the sense of a brief summary before settling into its modern meaning of a comprehensive collection of knowledge in one volume.
Related word forms
How compendium is actually used
Slightly formal but widely used in publishing and academic contexts; the tone is neutral-to-positive, suggesting thoroughness and authority. Plural forms: both "compendiums" and the Latinate "compendia" are accepted, with "compendia" more common in scholarly writing.
Easily confused with compendium
An appendix is supplementary material added at the end of a larger work, whereas a compendium is a complete, self-contained collection of information on a subject.