The state or quality of being defective.

plural of defectiveness

Having one or more defects. / (grammar, of a lexeme, especially a verb) Lacking some forms; e.g., having only one tense or being usable only in the third person.

(chiefly of abjad script) Without matres lectionis (letters indicating vowels) written out.

A person or thing considered to be defective. / (chiefly of abjad script) A word written without matres lectionis (letters indicating vowels).

A fault or malfunction. / The quantity or amount by which anything falls short. / (mathematics) A part by which a figure or quantity is wanting or deficient.

(intransitive) To abandon or turn against; to cease or change one's loyalty, especially from a military organisation or political party. / (military) To desert one's army, to flee from combat.

In a defective manner.

present participle of defect

An act or incidence of defecting.