In science, plenist, as opposed to a “vacuist”, refers to one who either denies the existence of the void (vacuum or nothingness), or adheres to the “nature abhors a vacuum” idiom; one who adheres to ether an Aristotelian and or Cartesian belief system, which holds that space is occupied by a continuous “plenum” of substance. [1]

The following are related quotes:

“The ‘plenum’ [space with atoms] and ‘void’ [space without atoms], according to Democritus, exist, the one as ‘being’, the other as ‘not being’.”
Aristotle (c.322BC), Physics (§1.4)

“The apparent triumph of the vacuists in the 17th century gave way, in the 19th century, to the apparent triumph of the plenists with their luminiferous aether. The displacement of the luminiferous aether by special relativity has still left us with a spacetime occupied by, among much else, oscillating electromagnetic fields.”
Thomas Conlon (2011), Thinking About Nothing (pg. 320) [1]

1. Conlon, Thomas. (2011). Thinking About Nothing: Otto von Guericke and the Magdeburg Experiments on the Vacuum (plenum, pg. 67; plenists, pgs. 319). Saint Austin Press/LuLu.

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