1. One who maintains that all space is full of matter.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• olenist,
• llenist,
• -lenist,
• 0lenist,
• pkenist,
• ppenist,
• poenist,
• plwnist,
• plsnist,
• pleniust,
• pleniest,
• pleenist,
• plennist,
• plenisst,
• plenistt,
• Planist,
• Pleinist,
• Pleineist,
• Palenist,
• Plenesst

The plural of the "Plenist" can be the "plenists".

The singular of the "Plenist" can be the "Plenist".