Entry 2 senses Webster, 1913 Radicality /(răd`ĭ*kăl"ĭ*ty̆)/ · Rad·i·cal·i·ty · IPA 01 n. Germinal principle; source; origination. 1. Germinal principle; source; origination.[Obs.] 2. Radicalness; relation to a root in essential nature or principle.