The Collaborative International Dictionary of English v.0.48:

Demur \De*mur"\, v. t.
   1. To suspend judgment concerning; to doubt of or hesitate
      about. [Obs.]
      [1913 Webster]

            The latter I demur, for in their looks
            Much reason, and in their actions, oft appears.
                                                  --Milton.
      [1913 Webster]

   2. To cause delay to; to put off. [Obs.]
      [1913 Webster]

            He demands a fee,
            And then demurs me with a vain delay. --Quarles.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Demur \De*mur"\ (d[-e]*m[^u]r"), v. i. [imp. & p. p. Demurred
   (d[-e]*m[^u]rd"); p. pr. & vb. n. Demurring.] [OF. demurer,
   demorer, demourer, to linger, stay, F. demeurer, fr. L.
   demorari; de- + morari to delay, tarry, stay, mora delay;
   prob. originally, time for thinking, reflection, and akin to
   memor mindful. See Memory.]
   1. To linger; to stay; to tarry. [Obs.]
      [1913 Webster]

            Yet durst not demur nor abide upon the camp.
                                                  --Nicols.
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   2. To delay; to pause; to suspend proceedings or judgment in
      view of a doubt or difficulty; to hesitate; to put off the
      determination or conclusion of an affair.
      [1913 Webster]

            Upon this rub, the English embassadors thought fit
            to demur.                             --Hayward.
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   3. To scruple or object; to take exception, especailly on the
      basis of scruple or modesty; as, I demur to that
      statement; they wanted to make him president, but he
      demurred.
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            When introduced as the world's smartest man, he was
            not inclined to demur.                --Kip Thorne
      [PJC]

   4. (Law) To interpose a demurrer. See Demurrer, 2.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Demur \De*mur"\, n. [OF. demor, demore, stay, delay. See
   Demur, v. i.]
   Stop; pause; hesitation as to proceeding; suspense of
   decision or action; scruple.
   [1913 Webster]

         All my demurs but double his attacks;
         At last he whispers, "Do; and we go snacks." --Pope.
   [1913 Webster]

WordNet (r) 3.0 (2006):

demur
    n 1: (law) a formal objection to an opponent's pleadings [syn:
         demur, demurral, demurrer]
    v 1: take exception to; "he demurred at my suggestion to work on
         Saturday" [syn: demur, except]
    2: enter a demurrer