Securities

noun, plural securities.
1.
freedom from danger, risk, etc.; safety.
2.
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.: claims that security was lax at the embassy;
the importance of computer security to prevent hackers from gaining access.
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.

something given or deposited as surety for the fulfillment of a promise or an obligation, the payment of a debt, etc.
one who becomes surety for another.

10.
an evidence of debt or of property, as a bond or a certificate of stock.
11.
Usually, securities. stocks and bonds.
12.
Archaic. overconfidence; cockiness.
adjective
13.
of, relating to, or serving as security:
The company has instituted stricter security measures.
noun (pl) -ties
1.
the state of being secure
2.
assured freedom from poverty or want: he needs the security of a permanent job
3.
a person or thing that secures, guarantees, etc
4.
precautions taken to ensure against theft, espionage, etc: the security in the government offices was not very good
5.
(often pl)

a certificate of creditorship or property carrying the right to receive interest or dividend, such as shares or bonds
the financial asset represented by such a certificate

6.
the specific asset that a creditor can claim title to in the event of default on an obligation
7.
something given or pledged to secure the fulfilment of a promise or obligation
8.
a person who undertakes to fulfil another person’s obligation
9.
the protection of data to ensure that only authorized personnel have access to computer files
10.
(archaic) carelessness or overconfidence

securities definition

Written evidence of ownership or creditorship, such as bonds and stock certificates.
In addition to the idiom beginning with security