se·cu·ri·ty /sɪˈkjʊrəti/
  安全,安全性,防護物,保衛,可靠性,擔保人,抵押品,保證金
  se·cu·ri·ty /sɪˈkjʊrətɪ/ 名詞
  安全,可靠性
  security
  安全; 安全性
  security
  保全 安全
  Se·cu·ri·ty n.; pl.  Securities
  1. The condition or quality of being secure; secureness. Specifically: (a) Freedom from apprehension, anxiety, or care; confidence of power or safety; hence, assurance; certainty.
  His trembling hand had lost the ease,
  Which marks security to please.   --Sir W. Scott.
  (b) Hence, carelessness; negligence; heedlessness.
  He means, my lord, that we are too remiss,
  Whilst Bolingbroke, through our security,
  Grows strong and great in substance and in power.   --Shak.
  (c) Freedom from risk; safety.
  Give up yourself merely to chance and hazard,
  From firm security.   --Shak.
     Some . . . alleged that we should have no security for our trade.   --Swift.
  2. That which secures or makes safe; protection; guard; defense. Specifically: (a) Something given, deposited, or pledged, to make certain the fulfillment of an obligation, the performance of a contract, the payment of a debt, or the like; surety; pledge.
     Those who lent him money lent it on no security but his bare word.   --Macaulay.
  (b) One who becomes surety for another, or engages himself for the performance of another's obligation.
  3. An evidence of debt or of property, as a bond, a certificate of stock, etc.; as, government securities.
  Syn: -- Protection; defense; guard; shelter; safety; certainty; ease; assurance; carelessness; confidence; surety; pledge; bail.
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  security
       n 1: the state of being free from danger or injury; "we support
            the armed services in the name of national security"
            [ant: insecurity]
       2: 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" [syn: certificate]
       3: a department responsible for the security of the
          institution's property and workers; "the head of security
          was a former policeman" [syn: security department]
       4: measures taken as a precaution against theft or espionage or
          sabotage etc.; "military security has been stepped up
          since the recent uprising" [syn: security measures]
       5: 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"
          [syn: protection]
       6: freedom from anxiety or fear; "the watch dog gave her a
          feeling of security"
       7: an electrical device that sets off an alarm when someone
          tries to break in [syn: security system, security
          measures]
       8: property that your creditor can claim in case you default on
          your obligation; "bankers are reluctant to lend without
          good security" [syn: surety]
       9: a guarantee that an obligation will be met [syn: surety]