agential adjective 2noun 1forms 3 adjective2 •Of or pertaining to an agent or an agency. •That forms agent nouns.Even if the suffix be formally identical with the agential suffix, it has not the same function. — 1918 noun1 •An affix that forms agent nouns.Semantically, a majority of agentials refer to avian vocalization. Examples are: screamer, whistler, warbler, trumpeter, and the suffixless chat. — 1986 formsagentials · more agential · most agential