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A compendium (pl. compendia or compendiums) is a comprehensive collection of information and analysis pertaining to a body of knowledge. A compendium may concisely summarize a larger work. In most cases, the body of knowledge will concern a specific field of human interest or endeavor (e.g. hydrogeology, logology, ichthyology, phytosociology or myrmecology), while a general encyclopedia can be referred to as a "compendium of all human knowledge". The word compendium arrives from the Latin word compeneri, meaning "to weigh together or balance". The 21st century has seen the rise of democratized, online compendia in various fields.

The Latin prefix con- is used in compound words to suggest, "a being or bringing together of many objects" and also suggests striving for completeness with perfection. And compenso means "to balance, poise, weigh, offset."

The entry on the word compendious in the Online Etymology Dictionary says "concise, abridged but comprehensive", "concise compilation comprising the general principles or leading points of a longer 'system or work'". Its etymology comes from a Medieval Latin use (com + pendere), literally meaning to weigh together.^[1]

A field guide is a compendium of species found within a geographic area, or within a taxon of natural occurrence such as animals, plants, rocks and minerals, or stars. Bestiaries were medieval compendiums that catalogued animals and facts about natural history, and were particularly popular in England and France around the 12th century.^{[citation needed]}

A cookbook is a compendium of recipes within a given food culture.^{[citation needed]}

An example would be the Catechism of the Catholic Church, a concise 598-question-and-answer book which summarises the teachings of the Catholic Church.^[2]

Most nations have compendiums or compilations of law meant to be comprehensive for use by their judiciary. For example, the 613 commandments, or the United States Code.^{[citation needed]}

The collected works of Aristotle is a compendium of natural philosophy, metaphysics, language arts, and social science.^{[citation needed]}

The single volume Propædia is Encyclopædia Britannica's compendium of the many volumes of its Macropaedia.^{[citation needed]}

The Bible is a group of many writings of the law, prophets, and writings of the Hebrew Bible held to be comprehensive and complete within Judaism and called the Old Testament by Christianity.^{[citation needed]}

Some well known literary figures have written their own compendium. An example would be Alexandre Dumas, author of The Three Musketeers, and a gourmand. His compendium on food titled From Absinthe to Zest serves as an alphabet for food lovers.^{[citation needed]}

• Anthology
• Edited volume
• Monograph
• Owners manual
• Treatise

Look up compendium in Wiktionary, the free dictionary.

• The Oxford English Dictionary site
• Medicines Compendium