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Definition of plenist in English:

plenist

Pronunciation /ˈpliːnɪst/

noun

historical

  • An adherent of the theory that all space is full of matter and that there is no such thing as a vacuum.

Origin

Mid 17th century; earliest use found in Robert Boyle (1627–1691), natural philosopher. From classical Latin plēnum plenum + -ist. Opposed to vacuist.