The Collaborative International Dictionary of English v.0.48:

Quibble \Quib"ble\, n. [Probably fr. quib, quip, but influenced
   by quillet, or quiddity.]
   1. A shift or turn from the point in question; a trifling or
      evasive distinction; an evasion; a cavil.
      [1913 Webster]

            Quibbles have no place in the search after truth. --
                                                  I. Watts.
      [1913 Webster]

   2. A pun; a low conceit.
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The Collaborative International Dictionary of English v.0.48:

Quibble \Quib"ble\, v. i. [imp. & p. p. Quibbled; p. pr. & vb.
   n. Quibbling.]
   1. To evade the point in question by artifice, play upon
      words, caviling, or by raising any insignificant or
      impertinent question or point; to trifle in argument or
      discourse; to equivocate.
      [1913 Webster]

   2. To pun; to practice punning. --Cudworth.
      [1913 Webster]

   Syn: To cavil; shuffle; equivocate; trifle.
        [1913 Webster]

WordNet (r) 3.0 (2006):

quibble
    n 1: an evasion of the point of an argument by raising
         irrelevant distinctions or objections [syn: quibble,
         quiddity, cavil]
    v 1: evade the truth of a point or question by raising
         irrelevant objections
    2: argue over petty things; "Let's not quibble over pennies"
       [syn: quibble, niggle, pettifog, bicker, squabble,
       brabble]