1) Having a valence of five 2) Power 3) Powerfulness 1) Quinquevalent 
• (a.) Having a valence of five; -- said of certain atoms and radicals.
(pen″tә-va´lәnt) having a valence of five.
Pen·tav'a·lent adjective [ Penta- + Latin valens , present participle See Valence .] (Chemistry) Having a valence of five; -- said of certain atoms and radicals. 
Type: Term Pronunciation: pen′tă-vā′lent, pen-tav′ă-lent Definitions: 1. Having a combining power (valence) of five. Synonyms: quinquevalent
[adj] - (chemistry) having a valence of five
adjective having a valence of five