Etymology
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security (n.)

early 15c., securite, "state or condition of being safe from danger or harm;" mid-15c., "freedom from care or anxiety" (a sense now archaic), from Old French securite and directly from Latin securitas "freedom from care," from securus "free from care" (see secure (adj.)).

This form replaced the earlier sikerte (early 15c.), which represents an earlier borrowing of the Latin word; earlier in English in the sense of "security" was sikerhede (early 13c.); sikernesse (c. 1200). Sir Thomas Browne uses securement; Francis Bacon and Mrs. Browning have secureness. Surety is a doublet, via French.

The meaning "something which secures, that which makes safe" is from 1580s. The specific legal sense of "something pledged as a guarantee of fulfillment of an obligation" is from mid-15c. (originally a guarantee of good behavior).

The meaning "safety of a state, person, etc." is by 1941. By 1965 Security, with the capital, was generic or shorthand for "security officials; a state's security department or ministry."

The legal sense of "property in bonds" is from mid-15c.; that of "document held by a creditor as evidence of debt or property and proof of right to payment" is from 1680s. Security-check (n.) is by 1945. Phrase security blanket in figurative sense is attested by 1966, in reference to the crib blanket carried by the character Linus in the popular "Peanuts" newspaper comic strip (the blanket, and the strip, from 1956).

updated on April 06, 2022

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Definitions of security from WordNet

security (n.)
the state of being free from danger or injury;
we support the armed services in the name of national security
security (n.)
defense against financial failure; financial independence;
his pension gave him security in his old age
Synonyms: protection
security (n.)
freedom from anxiety or fear;
the watch dog gave her a feeling of security
security (n.)
a formal declaration that documents a fact of relevance to finance and investment; the holder has a right to receive interest or dividends;
Synonyms: certificate
security (n.)
property that your creditor can claim in case you default on your obligation;
bankers are reluctant to lend without good security
Synonyms: surety
security (n.)
a department responsible for the security of the institution's property and workers;
the head of security was a former policeman
Synonyms: security department
security (n.)
a guarantee that an obligation will be met;
Synonyms: surety
security (n.)
an electrical device that sets off an alarm when someone tries to break in;
Synonyms: security system / security measure
security (n.)
measures taken as a precaution against theft or espionage or sabotage etc.;
military security has been stepped up since the recent uprising
Synonyms: security measures
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.