What is the meaning of safety?

noun

• The state of being certain that adverse effects will not be caused by some agent under defined conditions.
  • usage: "insure the safety of the children"; "the reciprocal of safety is risk"
• A safe place.
  • usage: "He ran to safety"
  • synonyms: refuge
• A device designed to prevent injury or accidents.
  • synonyms: guard, safety device
• Baseball) the successful act of striking a baseball in such a way that the batter reaches base safely.
  • synonyms: base hit
• Contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse.
  • synonyms: condom, rubber, safe, prophylactic
• A score in American football; a player is tackled behind his own goal line. .