De*fi"cien*cy (?), n.; pl. Deficiencies (#). [See Deficient.]
The state of being deficient; inadequacy; want; failure; imperfection; shortcoming; defect.
[Marlborough] was so miserably ignorant, that his deficiencies made him the ridicule of his contemporaries.
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.
© Webster 1913.