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security has 7 distinct synonyms spread across 7 of its 9 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is insecurity.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the state of being free from danger or injury
“we support the armed services in the name of national security”
Synonyms, antonyms and the broader and narrower relations for security come from Princeton University’s WordNet. Full sources and licences.
defense against financial failure; financial independence
“his pension gave him security in his old age”
freedom from anxiety or fear
“the watch dog gave her a feeling of security”
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”
property that your creditor can claim in case you default on your obligation
“bankers are reluctant to lend without good security”
a department responsible for the security of the institution's property and workers
“the head of security was a former policeman”
an electrical device that sets off an alarm when someone tries to break in
measures taken as a precaution against theft or espionage or sabotage etc.
“military security has been stepped up since the recent uprising”