The Collaborative International Dictionary of English v.0.48:

Meaning \Mean"ing\, n.
   1. That which is meant or intended; intent; purpose; aim;
      object; as, a mischievous meaning was apparent.
      [1913 Webster]

            If there be any good meaning towards you. --Shak.
      [1913 Webster]

   2. That which is signified, whether by act lanquage;
      signification; sense; import; as, the meaning of a hint.
      [1913 Webster]

   3. Sense; power of thinking. [R.]
      [1913 Webster] -- Mean"ing*less, a. -- Mean"ing*ly,
      adv.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

meaningless \meaningless\ adj.
   having no meaning; of no value; as, a meaningless endeavor; a
   meaningless life; a meaningless explanation. Opposite of
   meaningful. [Narrower terms: insignificant ; {mindless,
   unmeaning ; {nonsense(prenominal), nonsensical ; {pointless,
   purposeless ] Also See: {insignificant, unimportant,
   purposeless, unimportant.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

meaningless
    adj 1: having no meaning or direction or purpose; "a meaningless
           endeavor"; "a meaningless life"; "a verbose but
           meaningless explanation" [syn: meaningless,
           nonmeaningful] [ant: meaningful]