Source : Webster's Revised Unabridged Dictionary (1913)

Mild \Mild\, a. [Compar. {Milder}; superl. {Mildest}.] [AS.
   milde; akin to OS. mildi, D. & G. mild, OHG. milti, Icel.
   mildr, Sw. & Dan. mild, Goth. milds; cf. Lith. melas dear,
   Gr. ? gladdening gifts.]
   Gentle; pleasant; kind; soft; bland; clement; hence, moderate
   in degree or quality; -- the opposite of harsh, severe,
   irritating, violent, disagreeable, etc.; -- applied to
   persons and things; as, a mild disposition; a mild eye; a
   mild air; a mild medicine; a mild insanity.

         The rosy morn resigns her light And milder glory to the
         noon.                                    --Waller.

         Adore him as a mild and merciful Being.  --Rogers.

   {Mild}, or {Low}, {steel}, steel that has but little carbon
      in it and is not readily hardened.

   Syn: Soft; gentle; bland; calm; tranquil; soothing; pleasant;
        placid; meek; kind; tender; indulgent; clement;
        mollifying; lenitive; assuasive. See {Gentle}.

Mild \Mild\, a. [Compar. {Milder}; superl. {Mildest}.] [AS.
   milde; akin to OS. mildi, D. & G. mild, OHG. milti, Icel.
   mildr, Sw. & Dan. mild, Goth. milds; cf. Lith. melas dear,
   Gr. ? gladdening gifts.]
   Gentle; pleasant; kind; soft; bland; clement; hence, moderate
   in degree or quality; -- the opposite of harsh, severe,
   irritating, violent, disagreeable, etc.; -- applied to
   persons and things; as, a mild disposition; a mild eye; a
   mild air; a mild medicine; a mild insanity.

         The rosy morn resigns her light And milder glory to the
         noon.                                    --Waller.

         Adore him as a mild and merciful Being.  --Rogers.

   {Mild}, or {Low}, {steel}, steel that has but little carbon
      in it and is not readily hardened.

   Syn: Soft; gentle; bland; calm; tranquil; soothing; pleasant;
        placid; meek; kind; tender; indulgent; clement;
        mollifying; lenitive; assuasive. See {Gentle}.

Source : WordNet®

mild
     adj 1: moderate in type or degree or effect or force; far from
            extreme; "a mild winter storm"; "a mild fever";
            "fortunately the pain was mild"; "a mild rebuke";
            "mild criticism" [ant: {intense}]
     2: humble in spirit or manner; suggesting retiring mildness or
        even cowed submissiveness; "meek and self-effacing" [syn:
        {meek}, {modest}]
     3: mild and pleasant; "balmy days and nights"; "the climate was
        mild and conducive to life or growth" [syn: {balmy}]