necessary [ nec·e·ssa·ry ]
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Adjective
1. Needed to be done, achieved, or present; essential.
it's not necessary for you to be here
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2. Determined, existing, or happening by natural laws or predestination; inevitable.
It was an almost necessary consequence of using lenses.
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3. (of a concept, statement, etc.) inevitably resulting from the nature of things, so that the contrary is impossible.
There could be no solution, they claimed, until the mind first grasped the necessary idea.
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4. (of an agent) having no independent volition.
The sixth is that if a man were not a necessary agent he would be ignorant of morality and have no motive to practice it.
Noun
1. The basic requirements of life, such as food and warmth.
poor people complaining for want of the necessaries of life
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2. (the necessary) The action or item needed.
As I empathised with the poor guy, I obliged him by doing the necessary.
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3. (the necessary) The money needed.
a bag containing my wallet: the money, the necessary
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Origin
1. Late Middle English from Latin necessarius, from necesse ‘be needful’.

