De·fi·cien·cy n.; pl. Deficiencies   The state of being deficient; inadequacy; want; failure; imperfection; shortcoming; defect. “A deficiency of blood.”
    [Marlborough] was so miserably ignorant, that his deficiencies made him the ridicule of his contemporaries.   --Buckle.
 Deficiency of a curve Geom., the amount by which the number of double points on a curve is short of the maximum for curves of the same degree.

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