(number theory) A number that is greater than the sum of all of its divisors except itself.

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 absence of any opposing action.

(finance) The condition of failing to meet an obligation. / (finance) The condition of being an obligation that has not been met.

(intransitive, law) To fail to appear and answer a summons and complaint. / (intransitive, finance) To fail to fulfill a financial obligation.

Without question and beyond doubt. / In a definite manner; decisively.