Security

From Middle English securite, from Old French (French: sÃ©curitÃ©), from Latin securitas, from Latin securus "safe, secure".

Full definition of security

(countable and uncountable; plural securitys)

(uncountable) The condition of not being threatened, especially physically, psychologically, emotionally, or financially.

ShakespeareGive up yourself merely to chance and hazard,
From firm security.
Jonathan SwiftSome ... alleged that we should have no security for our trade.

(countable) Something that secures.
An organization or department responsible for providing security by enforcing laws, rules, and regulations as well as maintaining order.

2012-12-21, Simon Jenkins, We mustn't overreact to North Korea boys' toys, The threat of terrorism to the British lies in the overreaction to it of British governments. Each one in turn clicks up the ratchet of surveillance, intrusion and security. Each one diminishes liberty.
2013-06-08, The new masters and commanders, From the ground, Colomboâ€™s port does not look like much. Those entering it are greeted by wire fences, walls dating back to colonial times and security posts. For mariners leaving the port after lonely nights on the high seas, the delights of the B52 Night Club and Stallion Pub lie a stumble away.

(legal) Something that secures the fulfillment of an obligation or law.
(legal) Freedom from apprehension.
(finance) Proof of ownership of stocks, bonds or other investment instruments.
(finance) Property etc. temporarily relinquished to guarantee repayment of a loan.
A guarantee.

ShakespeareHe means, my lord, that we are too remiss,
Whilst Bolingbroke, through our security,
Grows strong and great in substance and in power.