Noun security has 9 senses
  1. security - the state of being free from danger or injury; "we support the armed services in the name of national security"
    --1 is a kind of
    safety
    Antonyms: insecurity
    --1 has particulars:
     peace, public security; secureness; protection, shelter
  2. security, certificate - a formal declaration that documents a fact of relevance to finance and investment; the holder has a right to receive interest or dividends; "he held several valuable securities"
    --2 is a kind of legal document, legal instrument, official document, instrument
    --2 has particulars:
     government security, agency security; mortgage-backed security; registered security; scrip; stock certificate, stock; bond, bond certificate; zero-coupon security; partnership certificate; proprietorship certificate; convertible, convertible security; letter security; listed security; unlisted security, over the counter security, OTC security
  3. security, security department - a department responsible for the security of the institution's property and workers; "the head of security was a former policeman"
    --3 is a kind of department, section
  4. security, security measures - measures taken as a precaution against theft or espionage or sabotage etc.; "military security has been stepped up since the recent uprising"
    --4 is a kind of precaution, safeguard, guard
  5. security, protection - defense against financial failure; financial independence; "his pension gave him security in his old age"; "insurance provided protection against loss of wages due to illness"
    --5 is a kind of assets
    --5 has particulars: easy street; hedge, hedging; insurance
  6. security - freedom from anxiety or fear; "the watch dog gave her a feeling of security"
    --6 is a kind of
    fearlessness, bravery
    --6 has particulars: confidence
  7. security system, security measures, security - an electrical device that sets off an alarm when someone tries to break in
    --7 is a kind of electrical device
  8. security, surety - property that your creditor can claim in case you default on your obligation; "bankers are reluctant to lend without good security"
    --8 is a kind of transferred property, transferred possession
    --8 has particulars:
     deposit; earnest; recognizance, recognisance; warrant, stock warrant, stock-purchase warrant
  9. security, surety - a guarantee that an obligation will be met
    --9 is a kind of guarantee, warrant, warrantee, warranty
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