The Collaborative International Dictionary of English v.0.48:

Meek \Meek\ (m[=e]k), a. [Compar. Meeker (m[=e]k"[~e]r);
   superl. Meekest.] [OE. mek, meoc; akin to Icel. mj[=u]kr
   mild, soft, Sw. mjuk, Dan. myg, D. muik, Goth. mukam[=o]dei
   gentleness.]
   1. Mild of temper; not easily provoked or orritated; patient
      under injuries; not vain, or haughty, or resentful;
      forbearing; submissive.
      [1913 Webster]

            Now the man Moses was very meek.      --Num. xii. 3.
      [1913 Webster]

   2. Evincing mildness of temper, or patience; characterized by
      mildness or patience; as, a meek answer; a meek face. "Her
      meek prayer." --Chaucer.
      [1913 Webster]

   Syn: Gentle; mild; soft; yielding; pacific; unassuming;
        humble. See Gentle.
        [1913 Webster] Meek

The Collaborative International Dictionary of English v.0.48:

Meek \Meek\, Meeken \Meek"en\ (-'n), v. t.
   To make meek; to nurture in gentleness and humility. [Obs.]
   --Chaucer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

meek
    adj 1: humble in spirit or manner; suggesting retiring mildness
           or even cowed submissiveness; "meek and self-effacing"
           [syn: meek, mild, modest]
    2: very docile; "tame obedience"; "meek as a mouse"- Langston
       Hughes [syn: meek, tame]
    3: evidencing little spirit or courage; overly submissive or
       compliant; "compliant and anxious to suit his opinions of
       those of others"; "a fine fiery blast against meek
       conformity"- Orville Prescott; "she looked meek but had the
       heart of a lion"; "was submissive and subservient" [syn:
       meek, spiritless]

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "meek":
   abject, accommodating, acquiescent, adapting, adaptive, adjusting,
   amenable, bland, broken, chastened, compliant, deferential, docile,
   domesticated, dovelike, forbearing, gentle, housebroken, humble,
   humble-minded, humble-spirited, humblehearted, lamblike, lenient,
   long-suffering, lowly, manageable, meek-minded, meek-spirited,
   meekhearted, mild, modest, obedient, pacific, passive, patient,
   peaceable, poor in spirit, quiet, reconciled, repressed, resigned,
   retiring, shy, spiritless, subdued, submissive, suppressed, tame,
   tamed, timid, tolerant, tractable, unambitious, unaspiring,
   unassuming, unboastful, uncomplaining, unimposing, unobtrusive,
   unostentatious, unpresuming, unpresumptuous, unpretending,
   unpretentious, unresisting, weak, yielding