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adj. Absolutely essential. See Synonyms at indispensable.

adj. Needed to achieve a certain result or effect; requisite: the necessary tools.

adj. Unavoidably determined by prior conditions or circumstances; inevitable: the necessary results of overindulgence.

adj. Logically inevitable.

adj. Required by obligation, compulsion, or convention: made the necessary apologies.

n. Something indispensable.

adj. needed, required

n. bathroom, toilet, loo

adj. Such as must be; impossible to be otherwise; not to be avoided; inevitable.

adj. Impossible to be otherwise, or to be dispensed with, without preventing the attainment of a desired result; indispensable; requisite; essential.

adj. Acting from necessity or compulsion; involuntary; -- opposed to free.

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.

n. A privy; a water-closet.

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

Such as must be; that cannot be otherwise.

Such that it cannot be disregarded or omitted; indispensable; requisite; essential; needful; required: as, air is necessary to support animal life; food is necessary to nourish the body.

In law:

Requisite for reasonable convenience and facility or completeness in accomplishing the purpose intended: as, the land necessary for building a railroad.

Naturally and inseparably connected in the ordinary course: as, necessary consequences.

Acting from compulsion or the absolute determination of causes: opposed to free. See free.

Synonyms Necessary, Essential, Requisite, Needful. The following remarks refer to the application of the words to ordinary practical affairs, not to philosophy. Necessary is so general a word that it covers all the others, and has the additional sense, which they do not have, of inevitable. Essential is an absolute word, noting that which is a part of the chief end of the action, or of every mode of bringing that end about. Requisite is less strong than essential, and needful is less strong still; yet each is strong and emphatic, applying to that which is imperatively needed. Needful generally applies to concrete, and often to temporary, things: as, knowledge of the countries visited is requisite, and even essential, to enjoyment of travel, but money is needful in order to be able to travel at all. Needful is often applied to that which must be supplied to produce or effect a perfect state or action.

n. Anything that is necessary or indispensable; that which cannot be disregarded or omitted: as, the necessaries of life.

n. A privy; a water-closet.

n. anything indispensable

adj. unavoidably determined by prior circumstances

adj. absolutely essential

"Prayer as the highest that can be lived on earth, telling Martha that activity, even in the most necessary duties, was not after all the best use to which time and love could be put, but rather that _Mary had chosen the best part ... the one thing that is necessary_, and that it"

inevitable    requisite    essential    indispensable    obligatory    needful    required    incumbent    needed   

superfluity    unnecessary   

consequential    axiomatic    unavoidable    necessary being    necessaries of a ship    necessary toan end    necessary proposition    necessary rules of thought    necessary cause    necessary condition   

necessitate    necessitude    necessariness    necessitation    necessity    necessitousness   

necessarily    necessary condition   

inevitable    indispensable    requisite    essential    involuntary    privy    water-closet    requirement    necessity    needment   

unnecessary   

proper    important    useful    taken    poor    essential    made    used    come    possible