Encyclopedias
Traditional
A traditional encyclopedia can be referred to a compendium of human knowledge.
Wikipedia
The free content, collaboratively edited encyclopedia, Wikipedia, can change the traditional meaning of the word compendium because of its ability to use hyperlinks to break things into their components and because of its ability to maintain a solid order of levels (based on the cumulative entries of the editors).
Etymology
The word compendium comes from the Latin word compendere, meaning "to weigh together".
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