(number theory) A deficient number.

(grammar) A verb with an incomplete conjugation; for example, one that can only be conjugated in certain persons and numbers.

(business, of an item) Upon receipt, damaged or defective to the point of being unusable.

plural of defective verb

plural of defective number

plural of defective matrix

(linear algebra) A square (n×n) matrix that has fewer than n linearly independent eigenvectors, and is therefore not diagonalisable.

(physics) the difference between the mass of an atom and the sum of the masses of its individual components in the free state; equivalent to the binding energy

(medicine) Any of several medical disorders that are present at birth.

(law) A problem with the chain of title to a parcel of real property that exposes the putative owner of the property to a potential legal dispute over the ownership of the property.