1. [n]  a ceremonial staff carried as a symbol of office or authority
2. [n]  spice made from the dried fleshy covering of the nutmeg seed
3. [n]  an official who carries a mace of office
4. [n]  (trademark) a liquid that temporarily disables a person; prepared as an aerosol and sprayed in the face, it irritates the eyes and causes dizziness and immobilization

1. \Mace\, n. [Jav. & Malay. m[=a]s, fr. Skr. m[=a]sha a
   bean.]
   A money of account in China equal to one tenth of a tael;
   also, a weight of 57.98 grains. --S. W. Williams.
   

2. \Mace\, n. [F. macis, L. macis, macir, Gr. ?; cf. Skr.
   makaranda the nectar or honey of a flower, a fragrant mango.]
   (Bot.)
   A kind of spice; the aril which partly covers nutmegs. See
   {Nutmeg}.
   Note: Red mace is the aril of {Myristica tingens}, and white
         mace that of {M. Otoba}, -- East Indian trees of the
         same genus with the nutmeg tree.
   

3. \Mace\, n. [OF. mace, F. masse, from (assumed) L. matea, of
   which the dim. mateola a kind of mallet or beetle, is found.]
   1. A heavy staff or club of metal; a spiked club; -- used as
      weapon in war before the general use of firearms,
      especially in the Middle Ages, for breaking metal armor.
      --Chaucer.
            Death with his mace petrific . . . smote. --Milton.
   2. Hence: A staff borne by, or carried before, a magistrate
      as an ensign of his authority. ``Swayed the royal mace.''
      --Wordsworth.
   3. An officer who carries a mace as an emblem of authority.
      --Macaulay.
   4. A knobbed mallet used by curriers in dressing leather to
      make it supple.
   5. (Billiards) A rod for playing billiards, having one end
      suited to resting on the table and pushed with one hand.
   {Mace bearer}, an officer who carries a mace before person in
      authority.
   

A concurrent object-oriented language.