When you search an online encyclopedia, you are searching a compendium of information on just about everything. A compendium is a comprehensive collection of something.

You can also use the word compendium to describe a collection of written works. If you gather all of the anecdotes your parents and grandparents have told you into a book, you'll have created a compendium of family stories. The plural of compendium is either compendiums or compendia.

Definitions of compendium

n a publication containing a variety of works

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a collection of selected literary passages
collection of records especially about an institution
compilation, digest
something that is compiled (as into a single book or file)
divan, diwan
a collection of Persian or Arabic poems (usually by one author)
florilegium, garland, miscellany
an anthology of short literary pieces and poems and ballads etc.
an anthology of articles on a related subject or an anthology of the works of a single author
Type of:
a copy of a printed work offered for distribution

n a concise but comprehensive summary of a larger work

Type of:
sum-up, summary
a brief statement that presents the main points in a concise form

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