freedom from care, anxiety, or doubt; well-founded confidence.
3.
something that secures or makes safe; protection; defense.
4.
freedom from financial cares or from want: The insurance policy gave the family security.
5.
precautions taken to guard against crime, attack, sabotage, espionage, etc.: The senator claimed security was lax and potential enemies know our plans.
6.
a department or organization responsible for protection or safety: He called security when he spotted the intruder.
7.
protection or precautions taken against escape; custody: The dangerous criminal was placed under maximum security.
8.
an assurance; guarantee.
9.
Law.
a.
something given or deposited as surety for the fulfillment of a promise or an obligation, the payment of a debt, etc.
b.
one who becomes surety for another.
10.
an evidence of debt or of property, as a bond or a certificate of stock.
early 15c., from L. securitas, from securus (see secure); phrase security blanket in figurative sense is attested from 1971, in reference to the crib blanket carried by the character Linus in the "Peanuts" comic strip (1956).