The Collaborative International Dictionary of English v.0.48:

Radicality \Rad`i*cal"i*ty\ (r[a^]d`[i^]*k[a^]l"[i^]*t[y^]), n.
   1. Germinal principle; source; origination. [Obs.] --Sir T.
      Browne.
      [1913 Webster]

   2. Radicalness; relation to a root in essential nature or
      principle.
      [1913 Webster]