Source : Webster's Revised Unabridged Dictionary (1913)

Safety \Safe"ty\, n. [Cf. F. sauvet['e].]
   1. The condition or state of being safe; freedom from danger
      or hazard; exemption from hurt, injury, or loss.

            Up led by thee, Into the heaven I have presumed, An
            earthly guest . . . With like safety guided down,
            Return me to my native element.       --Milton.

   2. Freedom from whatever exposes one to danger or from
      liability to cause danger or harm; safeness; hence, the
      quality of making safe or secure, or of giving confidence,
      justifying trust, insuring against harm or loss, etc.

            Would there were any safety in thy sex, That I might
            put a thousand sorrows off, And credit thy
            repentance!                           --Beau. & Fl.

   3. Preservation from escape; close custody.

            Imprison him, . . . Deliver him to safety; and
            return.                               --Shak.

   4. (Football) Same as Safety touchdown, below.

   {Safety arch} (Arch.), a discharging arch. See under
      {Discharge}, v. t.

   {Safety belt}, a belt made of some buoyant material, or which
      is capable of being inflated, so as to enable a person to
      float in water; a life preserver.

   {Safety buoy}, a buoy to enable a person to float in water; a
      safety belt.

   {Safety cage} (Mach.), a cage for an elevator or mine lift,
      having appliances to prevent it from dropping if the
      lifting rope should break.

   {Safety lamp}. (Mining) See under {Lamp}.

   {Safety match}, a match which can be ignited only on a
      surface specially prepared for the purpose.

   {Safety pin}, a pin made in the form of a clasp, with a guard
      covering its point so that it will not prick the wearer.
      

   {Safety plug}. See {Fusible plug}, under {Fusible}.

   {Safety switch}. See {Switch}.

   {Safety touchdown} (Football), the act or result of a
      player's touching to the ground behind his own goal line a
      ball which received its last impulse from a man on his own
      side; -- distinguished from touchback. See {Touchdown}.

Safety \Safe"ty\, n.
   (a) (Amer. Football) A safety touchdown.
   (b) Short for {Safety bicycle}.

Source : WordNet®

safety
     n 1: the state of being certain that adverse effects will not be
          caused by some agent under defined conditions; "insure
          the safety of the children"; "the reciprocal of safety
          is risk" [ant: {danger}]
     2: a safe place; "He ran to safety" [syn: {refuge}]
     3: a device designed to prevent injury [syn: {guard}, {safety
        device}]
     4: (baseball) the successful act of striking a baseball in such
        a way that the batter reaches base safely [syn: {base hit},
         {bingle}]
     5: contraceptive device consisting of a thin rubber or latex
        sheath worn over the penis during intercourse [syn: {condom},
         {rubber}, {safe}, {prophylactic}]
     6: a score in American football; a player is tackled behind his
        own goal line

Source : Free On-Line Dictionary of Computing

safety
     
        See {safe}, {safety-critical system}.