security
noun
plural securities
Definition of security
1
: the quality or state of being secure: such as
a
: freedom from danger : safety
b
: freedom from fear or anxiety
c
: freedom from the prospect of being laid off
job security
2a
: something given, deposited, or pledged to make certain the fulfillment of an obligation
b
: surety
3
: an instrument of investment in the form of a document (such as a stock certificate or bond) providing evidence of its ownership
4a
: something that secures : protection
b(1)
: measures taken to guard against espionage or sabotage, crime, attack, or escape
(2)
: an organization or department whose task is security
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