Source : Webster's Revised Unabridged Dictionary (1913)

Sacs \Sacs\ (s[add]ks), n. pl.; sing. {Sac}. (Ethnol.)
   A tribe of Indians, which, together with the Foxes, formerly
   occupied the region about Green Bay, Wisconsin. [Written also
   {Sauks}.]

Sac \Sac\, n. [See {Sake}, {Soc}.] (O.Eng. Law)
   The privilege formerly enjoyed by the lord of a manor, of
   holding courts, trying causes, and imposing fines. --Cowell.

Sac \Sac\ (s[add]k), n. (Ethnol.)
   See {Sacs}.

Sac \Sac\ (s[a^]k), n. [F., fr. L. saccus a sack. See {Sack} a
   bag.]
   1. See 2d {Sack}.

   2. (Biol.) A cavity, bag, or receptacle, usually containing
      fluid, and either closed, or opening into another cavity
      to the exterior; a sack.

Source : WordNet®

sac
     n 1: an enclosed space; "the trapped miners found a pocket of
          air" [syn: {pouch}, {sack}, {pocket}]
     2: a case or sheath especially a pollen sac or moss capsule
        [syn: {theca}]
     3: a member of the Algonquian people formerly living in
        Wisconsin in the Fox River valley and on the shores of
        Green Bay [syn: {Sauk}]
     4: a structure resembling a bag in an animal

Source : Free On-Line Dictionary of Computing

SAC
     
        1. An early system on the {Datatron 200} series.
     
        [Listed in CACM 2(5):16 (May 1959)].
     
        (1995-04-12)
     
        2. {Service Access Controller}.
     
        (2002-12-30)