The Collaborative International Dictionary of English v.0.48:

Meekness \Meek"ness\, n.
   The quality or state of being meek.
   [1913 Webster]

WordNet (r) 3.0 (2006):

meekness
    n 1: the feeling of patient, submissive humbleness [syn:
         meekness, submission]
    2: a disposition to be patient and long suffering [syn:
       meekness, subduedness]

Easton's 1897 Bible Dictionary:

Meekness
   a calm temper of mind, not easily provoked (James 3:13).
   Peculiar promises are made to the meek (Matt. 5:5; Isa. 66:2).
   The cultivation of this spirit is enjoined (Col. 3:12; 1 Tim.
   6:11; Zeph. 2:3), and is exemplified in Christ (Matt. 11:29),
   Abraham (Gen. 13; 16:5, 6) Moses (Num. 12:3), David (Zech. 12:8;
   2 Sam. 16:10, 12), and Paul (1 Cor. 9:19).


The Devil's Dictionary (1881-1906):

MEEKNESS, n.  Uncommon patience in planning a revenge that is worth
while.

    M is for Moses,
        Who slew the Egyptian.
    As sweet as a rose is
    The meekness of Moses.
    No monument shows his
        Post-mortem inscription,
    But M is for Moses
        Who slew the Egyptian.
                                           _The Biographical Alphabet_