GNU Collaborative International Dictionary of English

Found one definition

1.       
   Defiant (?), a. [Cf. F. défiant, p. pr. of défier. See Defy.] Full of defiance; bold; insolent; as, “a defiant spirit or act”.
   
   [1913 Webster]
   
   In attitude stern and defiant. Longfellow.
   
   -- De*fi"ant*ly, adv. -- De*fi"ant*ness, n.
   
   [1913 Webster]