Encyclopedias and dictionaries are considered tertiary sources. They collect information from primary and secondary sources, combining and condensing the information in one place. Reference works do not provide new information on a topic, and they also do not provide a viewpoint on a topic. Instead, they present information researched by others.
According to Britannica, an encyclopedia is a "reference work that contains information on all branches of knowledge or that treats a particular branch of knowledge in a comprehensive manner" (Collison and Preece, 2024). While dictionaries, atlases, and directories are also reference works, only an encyclopedia "attempts to offer a comprehensive summary of what is known of each topic considered" instead of "convey[ing] some information concerning every item it deals with." That is, encyclopedias collect more information than dictionaries and often provide a more in-depth exploration.
Collison, Robert L. and Preece, Warren E.. "encyclopaedia". Encyclopedia Britannica, 9 Mar. 2024, https://www.britannica.com/topic/encyclopaedia.
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