1) Having a valence of three 2) Power 3) Powerfulness 
• (a.) Having a valence of three; capable of being combined with, substituted for, or compared with, three atoms of hydrogen; -- said of triad atoms or radicals; thus, nitrogen is trivalent in ammonia.
(tri- + L. valens powerful) having a valence of three.
<chemistry> Having a valence of three. ... Origin: L. Valens = powerful ... (18 Nov 1997) ... 
(tri-va´lәnt) having a valence of three.
Type: Term Pronunciation: trī-vā′lent Definitions: 1. Having combining power (valence) of 3.
[adj] - (chemistry) having a valence of three
adjective having a valence of three