Source : Webster's Revised Unabridged Dictionary (1913)

Adequacy \Ad"e*qua*cy\, n. [See {Adequate}.]
   The state or quality of being adequate, proportionate, or
   sufficient; a sufficiency for a particular purpose; as, the
   adequacy of supply to the expenditure.

Source : WordNet®

adequacy
     n 1: the quality of being able to meet a need satisfactorily: "he
          questioned the adequacy of the usual sentimental
          interpretation of the Golden Rule" [syn: {adequateness}]
          [ant: {inadequacy}]
     2: the quality of being sufficient for the end in view; "he
        questioned the sufficiency of human intelligence" [syn: {sufficiency}]
        [ant: {insufficiency}, {insufficiency}]