Related formstri·ad·ic, adjectivetri·ad·ism, noun
Examples from the Web for triadic
As the total system falls into three parts, so every part of the system follows the triadic law.
Truth would be a triadic relation, but of a different sort from that expounded by Mr. Russell.Essays in Experimental Logic|John Dewey
For Kempe's triadic relation in question can be stated, in what he calls its obverse form, in perfectly symmetrical terms.