noun, plural securities.
freedom from danger, risk, etc.; safety.
freedom from care, anxiety, or doubt; well-founded confidence.
something that secures or makes safe; protection; defense.
freedom from financial cares or from want: The insurance policy gave the family security.
precautions taken to guard against crime, attack, sabotage, espionage, etc.: The senator claimed security was lax and potential enemies know our plans.
a department or organization responsible for protection or safety: He called security when he spotted the intruder.
protection or precautions taken against escape; custody: The dangerous criminal was placed under maximum security.
an assurance; guarantee.
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.
an evidence of debt or of property, as a bond or a certificate of stock.
Usually, securities. stocks and bonds.
Archaic. overconfidence; cockiness.
of, pertaining to, or serving as security: The company has instituted stricter security measures.

1400–50; late Middle English securytye, securite(e) < Latin sēcūritās. See secure, -ity

nonsecurity, noun, plural nonsecurities.
oversecurity, noun
self-security, noun
subsecurity, noun, plural subsecurities.

2. assurance, certainty, positiveness. 3. safeguard, safety. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
security (sɪˈkjʊərɪtɪ)
n , 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 plural)
 a.  a certificate of creditorship or property carrying the right to receive interest or dividend, such as shares or bonds
 b.  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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

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).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

securities definition

Written evidence of ownership or creditorship, such as bonds and stock certificates.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Maybe you can convince me there can be bubbles in individual securities.
Bundling mortgages into securities made home ownership possible for many.
Debtors of all kinds find that their securities are no longer the equal of
  their debts.
Third, they could help investors to get comfortable with mortgage securities
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