Webster's Revised Unabridged Dictionary · 1913

Security

Security , noun

[Latin securitas: compare French sécurité. See Secure, and compare Surety.]

1.
The condition or quality of being secure; secureness.
(a)
Freedom from apprehension, anxiety, or care; confidence of power or safety; hence, assurance; certainty.
His trembling hand had lost the ease, Which marks security to please. — Sir W. Scott
(b)
Hence, carelessness; negligence; heedlessness.
He means, my lord, that we are too remiss, Whilst Bolingbroke, through our security, Grows strong and great in substance and in power. — Shakespeare
(c)
Freedom from risk; safety.
Give up yourself merely to chance and hazard, From firm security. — Shakespeare
Some... alleged that we should have no security for our trade. — Swift
2.
That which secures or makes safe; protection; guard; defense.
(a)
Something given, deposited, or pledged, to make certain the fulfillment of an obligation, the performance of a contract, the payment of a debt, or the like; surety; pledge.
Those who lent him money lent it on no security but his bare word. — Macaulay
(b)
One who becomes surety for another, or engages himself for the performance of another's obligation.
3.
An evidence of debt or of property, as a bond, a certificate of stock, etc.; as, government securities.