Relating to or characteristic of an encyclopedia; having the nature or scope of a comprehensive reference work.
From encyclopedia (from Greek enkyklios 'circular, general' + paideia 'education') + -ac suffix meaning 'of or relating to.' The term emerged in the 18th century alongside the rise of comprehensive reference works.
This rare adjective was most popular in the 1700s-1800s when encyclopedias represented humanity's ambitious attempt to capture all human knowledge in one place—a distinctly Enlightenment dream.
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