Etymology
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security (n.)

mid-15c., "condition of being secure," from Latin securitas, from securus "free from care" (see secure). Replacing sikerte (early 15c.), from an earlier borrowing from Latin; earlier in the sense "security" was sikerhede (early 13c.); sikernesse (c. 1200).

Meaning "something which secures" is from 1580s; "safety of a state, person, etc." is from 1941. Legal sense of "property in bonds" is from mid-15c.; that of "document held by a creditor" is from 1680s. Phrase security blanket in figurative sense is attested from 1966, in reference to the crib blanket carried by the character Linus in the "Peanuts" comic strip (1956).

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Definitions of security

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
From wordnet.princeton.edu