Meaning
A space that is completely filled with matter.
Etymology
Origin: Latin
From Latin plēnum n (“space filled with matter”), from plēnus (“full”). The sense of "legislative meeting" is a semantic loan from Russian пле́нум (plénum, “plenary session”), from the same Latin source.
Synonyms & Antonyms
Antonyms
vacuum
NYT Puzzle Appearances
Accepted in 2 recorded puzzles: