1. (a.) Such as must be; impossible to be otherwise; not to be avoided; inevitable.

2. (a.) Impossible to be otherwise, or to be dispensed with, without preventing the attainment of a desired result; indispensable; requiste; essential.

3. (a.) Acting from necessity or compulsion; involuntary; -- opposed to free; as, whether man is a necessary or a free agent is a question much discussed.

4. (n.) A thing that is necessary or indispensable to some purpose; something that one can not do without; a requisite; an essential; -- used chiefly in the plural; as, the necessaries of life.

5. (n.) A privy; a water-closet.

6. (n.) Such things, in respect to infants, lunatics, and married women, as are requisite for support suitable to station.

absolute apodictic backhouse binding bound called for cardinal certain choiceless clear clear and distinct clear as day closet compelling compulsory conclusive constraining crapper de rigueur decisive definite determinate dictated essential exigent fated fateful fundamental imperative imperious important importunate indefeasible indicated indispensable ineluctable ineludible inerrable inerrant inescapable inevasible inevitable inexorable infallible inflexible involuntary irreducible irreductible irreplaceable irresistible irrevocable jakes mandatory momentous must necessitous needed needful obligatory office outhouse peremptory perfectly sure positive predestined predetermined prerequisite relentless required requisite resistless significant sure sure as death sure as fate sure-enough TRUE unambiguous unavoidable uncontrollable undeflectable unequivocal unerring unevadable unforgoable univocal unmistakable unpreventable unstoppable unyielding urgent vital wanted without choice