availableness
  U可得,有效
  A·vail·a·ble·ness, n.
  1. Competent power; validity; efficacy; as, the availableness of a title. [Obs.]
  2. Quality of being available; capability of being used for the purpose intended.
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  availableness
       n : the quality of being at hand when needed [syn: handiness,
           accessibility, availability] [ant: inaccessibility,
            inaccessibility]