The difference between Necessity and Requirement
When used as nouns, necessity means the quality or state of being necessary, unavoidable, or absolutely requisite, whereas requirement means a necessity or prerequisite.
check bellow for the other definitions of Necessity and Requirement
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Necessity as a noun:
The quality or state of being necessary, unavoidable, or absolutely requisite.
Examples:
"I bought a new table out of necessity. My old one was ruined."
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Necessity as a noun:
The condition of being needy; desperate need; lack
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Necessity as a noun:
Something necessary; a requisite; something indispensable.
Examples:
"A tent is a necessity if you plan on camping."
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Necessity as a noun:
Something which makes an act or an event unavoidable; an irresistible force; overruling power
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Necessity as a noun:
The negation of freedom in voluntary action; the subjection of all phenomena, whether material or spiritual, to inevitable causation; necessitarianism.
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Necessity as a noun (legal):
Greater utilitarian good; used in justification of a criminal act.
Examples:
"[[doctrine of necessity]]"
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Necessity as a noun (legal, in the plural):
Indispensable requirements (of life).
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Requirement as a noun:
A necessity or prerequisite; something required or obligatory. Its adpositions are generally of in relation to who or what has given it, on in relation to whom or what it is given to, and for in relation to what is required.
Examples:
"There was a requirement of the government on citizens for paying taxes."
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Requirement as a noun:
Something asked.
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Requirement as a noun (engineering, computing):
A statement (in domain specific terms) which specifies a verifiable constraint on an implementation that it shall undeniably meet or (a) be deemed unacceptable, or (b) result in implementation failure, or (c) result in system failure.