Meaning of security system in English:

security system

noun

  • 1(Especially in Hong Kong) a system whereby a local merchant stands as surety for foreign traders to ensure good conduct and payment of debts (now historical).

  • 2Any system put in place to ensure or maintain the security of a person or thing; specifically an electronic system designed to detect and warn of intruders in a house, building, etc.

Origin

Mid 19th century.