Plenus

Plenus is a Latin adjective meaning full, filled, complete, or satisfied. The term appears in classical Latin texts and has given rise to a family of English words through Latin and French intermediaries, all retaining the sense of fullness or completeness.

In Latin, plenus adapts to gender and case (for example plenus, plena, plenum in masculine, feminine, and neuter singular forms). It is used to describe bodily fullness, abundance, or perfection, and as a figurative descriptor in literature and inscriptions.

In modern English, the root appears in several common terms: plenary (full, complete; as in a plenary session), plenitude (the state of being full or abundant), plenum (the full space, contrasted with vacuum), and plenipotentiary (a person invested with full powers). The adjective form gave rise to related words such as plenary and plenitude; and the broader semantic field underpins words like plentiful and plenty through the evolution of Romance-language derivatives.

Outside linguistic usage, there is no widely recognized scientific taxon or geographic entity named Plenus; the word is primarily used as a lexical root in Latin and in derived terms.