Syn*tac"tic*al*ly

from The Collaborative International Dictionary of English v.0.48

Syntactic \Syn*tac"tic\, Syntactical \Syn*tac"tic*al\, a. [Cf.
   G. ? putting together. See {Syntax}.]
   Of or pertaining to syntax; according to the rules of syntax,
   or construction. -- {Syn*tac"tic*al*ly}, adv.
   [1913 Webster]