alternating

from WordNet (r) 3.0 (2006)

alternating
    adj 1: (of a current) reversing direction; "alternating current"
           [ant: {direct}]
    2: occurring by turns; first one and then the other;
       "alternating feelings of love and hate" [syn: {alternate(a)},
       {alternating(a)}]

from The Collaborative International Dictionary of English v.0.48

Alternate \Al"ter*nate\ (?; 277), v. t. [imp. & p. p.
   {Alternated}; p. pr. & vb. n. {Alternating}.] [L. alternatus,
   p. p. of alternare. See {Altern}.]
   To perform by turns, or in succession; to cause to succeed by
   turns; to interchange regularly.
   [1913 Webster]

         The most high God, in all things appertaining unto this
         life, for sundry wise ends alternates the disposition
         of good and evil.                        --Grew.
   [1913 Webster]