1. [n]  the successful act of striking a baseball in such a way that the batter reaches base safely
2. [n]  a score in American football; a player is tackled behind his own goal line
3. [n]  contraceptive device consisting of a thin rubber or latex sheath worn over the penis during intercourse
4. [n]  a device designed to prevent injury
5. [n]  a safe place; "He ran to safety"
6. [n]  the state of being safe; "the safety of the children"

Safety
Discusses how to stay safe in many different situations, including at home, while swimming, and playing, and explains the importance of safety for overall health.

more details ...

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

2. \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 tube} (Chem.), a tube to prevent explosion, or to
      control delivery of gases by an automatic valvular
      connection with the outer air; especially, a bent funnel
      tube with bulbs for adding those reagents which produce
      unpleasant fumes or violent effervescence.
   {Safety valve}, a valve which is held shut by a spring or
      weight and opens automatically to permit the escape of
      steam, or confined gas, water, etc., from a boiler, or
      other vessel, when the pressure becomes too great for
      safety; also, sometimes, a similar valve opening inward to
      admit air to a vessel in which the pressure is less than
      that of the atmosphere, to prevent collapse.
   

See safe, safety-critical system.