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.]
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            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.
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            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.
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