Wanting, to make up completeness; wanting, as regards a requirement; not sufficient; inadequate; defective; imperfect; incomplete; lacking; as, deficient parts; deficient estate; deficient strength; deficient in judgment.

Incomplete; defective; not sufficient in quantity or force.

lacking something This food is deficient in all the essential vitamins. deficiently (adv), deficiency (n)

A number is deficient if sigma(n) 2n, or, equivalently, if (n) 2. Another way of saying this is that sum of the proper divisors of n is less than n. Contrast abundant, perfect. Every divisor of a deficient number is deficient.

falling short of some prescribed norm; "substandard housing"

of a quantity not able to fulfill a need or requirement; "insufficient funds"