Definify.com
Webster 1913 Edition
Necessary
Nec′es-sa-ry
,Adj.
 [L. 
necessarius
, from necesse 
unavoidable, necessary; of uncertain origin: cf. F. nécessaire
.] 1. 
Such as must be; impossible to be otherwise; not to be avoided; inevitable. 
Death, a 
Will come when it will come.
necessary 
end,Will come when it will come.
Shakespeare
2. 
Impossible to be otherwise, or to be dispensed with, without preventing the attainment of a desired result; indispensable; requisite; essential. 
“’T is necessary he should die.” Shak.
 A certain kind of temper is 
necessary 
to the pleasure and quiet of our minds. Tillotson.
3. 
Acting from necessity or compulsion; involuntary; – opposed to 
 free
; as, whether man is a 
. necessary 
or a free agent is a question much discussedNec′es-sa-ry
,Noun.
pl. 
Necessaries
. 1. 
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 life2. 
A privy; a water-closet. 
3. 
pl. 
(Law) 
Such things, in respect to infants, lunatics, and married women, as are requisite for support suitable to station. 
Webster 1828 Edition
Necessary
NECESSARY
,Adj.
 1.
 That must be; that cannot be otherwise; indispensably requisite.  It is necessary that every effect should have a cause.2.
 Indispensable; requisite; essential; that cannot be otherwise without preventing the purpose intended.  Air is necessary to support animal life; food is necessary to nourish the body; holiness is a necessary qualification for happiness; health is necessary to the enjoyment of pleasure; subjection to law is necessary to the safety of persons and property.3.
 Unavoidable; as a necessary inference or consequence from facts or arguments.4.
 Acting from necessity or compulsion; opposed to free.  Whether man is a necessary or a free agent is a question much discussed.NECESSARY
,Noun.
 Definition 2025
necessary
necessary
English
Adjective
necessary (comparative more necessary, superlative most necessary)
-  Required, essential, whether logically inescapable or needed in order to achieve a desired result or avoid some penalty.
- Although I wished to think that all was false, it was yet necessary that that I, who thus thought, must in some sense exist.
 - It is absolutely necessary that you call and confirm your appointment.
 
- c. 1605, William Shakespeare & al., The Life of Tymon of Athens, Act III, Scene vi, ll. 1258-60:
 
 -  Unavoidable, inevitable.
- If it is absolutely necessary to use public computers, you should plan ahead and forward your e-mail to a temporary, disposable account.
 
 -  (obsolete) Determined, involuntary: acting from compulsion rather than free will.
-  1871, Richard Holt Hutton, Essays, Vol. I, p. 53:
- But that a necessary being should give birth to a being with any amount, however limited, of moral freedom, is infinitely less conceivable than that parents of the insect or fish type should give birth to a perfect mammal.
 
 
 -  1871, Richard Holt Hutton, Essays, Vol. I, p. 53:
 
Synonyms
- (needed): See also Wikisaurus:requisite
 - (such as must be): inevitable, natural
 
Antonyms
- (needed): unnecessary
 - (such as must be): evitable, incidental, impossible
 
Derived terms
Related terms
Related terms
Translations
needed, required
  | 
  | 
such as must be
  | 
Noun
necessary (plural necessaries)
- (Britain, archaic euphemistic, usually with the definite article) A place to do the "necessary" business of urination and defecation: an outhouse or lavatory.
 
Synonyms
- See Wikisaurus:bathroom
 
Related terms
- necessary house; necessary place, necessary stool, necessary vault (obsolete)
 
Statistics
Most common English words before 1923: sight · electronic · sea · #457: necessary · idea · reached · appeared