The Collaborative International Dictionary of English v.0.48:

Dilatory \Dil"a*to*ry\, a. [L. dilatorius, fr. dilator a
   delayer, fr. dilatus, used as p. p. of differe to defer,
   delay: cf. F. dilatoire. See Dilate, Differ, Defer.]
   1. Inclined to defer or put off what ought to be done at
      once; given the procrastination; delaying;
      procrastinating; loitering; as, a dilatory servant.
      [1913 Webster]

   2. Marked by procrastination or delay; tardy; slow; sluggish;
      -- said of actions or measures.
      [1913 Webster]

            Alva, as usual, brought his dilatory policy to bear
            upon his adversary.                   --Motley.
      [1913 Webster]

   Dilatory plea (Law), a plea designed to create delay in the
      trial of a cause, generally founded upon some matter not
      connected with the merits of the case.

   Syn: Slow; delaying; sluggish; inactive; loitering;
        behindhand; backward; procrastinating. See Slow.
        [1913 Webster]

WordNet (r) 3.0 (2006):

dilatory
    adj 1: wasting time [syn: dilatory, laggard, poky,
           pokey]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "dilatory":
   Micawberish, apathetic, backward, balking, balky, bone-lazy,
   cadging, dallying, dawdling, delaying, deliberate, dillydallying,
   do-nothing, doless, dragging, dronish, drony, easy, easygoing,
   ergophobic, faineant, foot-dragging, good-for-nothing, grudging,
   indifferent, indolent, lackadaisical, laggard, lagging, lax, lazy,
   leisurely, lingering, loath, loitering, lollygagging, neglectful,
   negligent, nonaggressive, parasitic, perfunctory, procrastinating,
   procrastinative, procrastinatory, reluctant, remiss, renitent,
   restive, scrounging, shiftless, shilly-shallying, shuffling, slack,
   slothful, slow, slow to, sluggish, sponging, tarrying,
   unenterprising, unenthusiastic, unhasty, unhurried, unzealous,
   work-shy



Bouvier's Law Dictionary, Revised 6th Ed (1856):

DILATORY. That which is intended for delay. It is a maxim, that delays in
law are odious, dilationes in lege sunt odiosae. Plowd. 75.