4. (noun)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 Synonyms: surety, security system, protection, security measures, credentials, certificate, credential, certification, securitymeasure, security, securitydepartment Antonyms: insecurity
8. (noun)security system, security measure, security an electrical device that sets off an alarm when someone tries to break in Synonyms: surety, securitysystem, protection, security measures, certificate, security measure, security, security department Antonyms: insecurity
9. (noun)security, security measures measures taken as a precaution against theft or espionage or sabotage etc. Synonyms: surety, security system, protection, security measures, certificate, security measure, security, security department Antonyms: insecurity