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Definition of necessity : 1. That which is necessary; a necessary; a requisite; something indispensable; - often in the plural.
2. That which makes an act or an event unavoidable; irresistible force; overruling power; compulsion, physical or moral; fate; fatality.
3. The condition of being needy or necessitous; pressing need; indigence; want.
4. The negation of freedom in voluntary action; the subjection of all phenomena, whether material or spiritual, to inevitable causation; necessitarianism.
5. The quality or state of being necessary, unavoidable, or absolutely requisite; inevitableness; indispensableness.

Synonyms:

want, poverty, stress, beggary, necessary, pauperism, destitution, needful, sine qua non, must-have, urgency, indispensableness, mare, task, exigency, desideratum, exigence, fundamental, emergency, priority, justification, headache, impoverishment, reason, pinch, pressure, impecuniosity, burden, call, surely, exaction, fate, extremity, unavoidableness, poorness, essentiality, staple, key, struggle, core, occasion, the impossible, privation, a tall order, element, destituteness, penuriousness, penury, essential, why, necessarily, ground, basis, inexorableness, precondition, the elephant in the room, essence, concern, importantly, indigence, feature, cause, destiny, neediness, impecuniousness, lack, chore, start, burning issue/question, wherefore, claim, fatality, indispensability

obligation (part of speech: noun)

inexorability, compulsion, need, mandate, must, obligation, constraint, demand, requirement

requirement (part of speech: noun)

inevitability, prerequisite, imperative, condition, proviso, stipulation, requisite

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