Source : Webster's Revised Unabridged Dictionary (1913)

Warrantise \War"rant*ise\, n. [OF. warentise, warandise,
   garantise. See {Warrant}, n.]
   Authority; security; warranty. [Obs.] --Shak.

Warrantise \War"rant*ise\, v. t.
   To warrant. [Obs.] --Hakluyt.