Open English Wordnet
Nouns
(n)security, protectiondefense against financial failure; financial independence“his pension gave him security in his old age”, “insurance provided protection against loss of wages due to illness”
(n)security, certificatea 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”
(n)security, security departmenta department responsible for the security of the institution's property and workers“the head of security was a former policeman”
(n)security system, security measure, securityan electrical device that sets off an alarm when someone tries to break in
(n)security, security measuresmeasures taken as a precaution against theft or espionage or sabotage etc.“military security has been stepped up since the recent uprising”