The Collaborative International Dictionary of English v.0.48:

Guide \Guide\, v. t. [imp. & p. p. Guided; p. pr. & vb. n.
   Guiding.] [OE. guiden, gyden, F. guiaer, It. guidare; prob.
   of Teutonic origin; cf. Goth. ritan to watch over, give heed
   to, Icel. viti signal, AS. witan to know. The word prob.
   meant, to indicate, point to, and hence, to show the way. Cf.
   Wit, Guy a rope, Gye.]
   [1913 Webster]
   1. To lead or direct in a way; to conduct in a course or
      path; to pilot; as, to guide a traveler.
      [1913 Webster]

            I wish . . . you 'ld guide me to your sovereign's
            court.                                --Shak.
      [1913 Webster]

   2. To regulate and manage; to direct; to order; to
      superintend the training or education of; to instruct and
      influence intellectually or morally; to train.
      [1913 Webster]

            He will guide his affairs with discretion. --Ps.
                                                  cxii. 5.
      [1913 Webster]

            The meek will he guide in judgment.   --Ps. xxv. 9.
      [1913 Webster]

WordNet (r) 3.0 (2006):

guiding
    adj 1: exerting control or influence; "a guiding principle"
    2: showing the way by conducting or leading; imposing direction
       on; "felt his mother's directing arm around him"; "the
       directional role of science on industrial progress" [syn:
       directing, directional, directive, guiding]