Webster's English Dictionary

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security

se.cu.ri.ty \si-'kyu.r-*t-e-\ n 1: the quality or state of being secure : 
   as  1a: freedom from danger : SAFETY  1b: freedom from fear or anxiety  2a: 
   something given, deposited, or pledged to make certain the fulfillment  of 
   an obligation 2b: SURETY  3: an evidence of debt or of property (as a stock 
   certificate or bond)  4a: something that secures : PROTECTION  4b: measures 
   taken esp. to guard against espionage or sabotage