All sine qua non synonyms
si·ne qua non
S s noun sine qua non
- devoir — duty; obligation
- desideratum — something lacked and wanted
- ought — a cipher (0); zero.
- essential — Absolutely necessary; extremely important.
- linchpin — a pin inserted through the end of an axletree to keep the wheel on.
- qualification — a quality, accomplishment, etc., that fits a person for some function, office, or the like.
- devoirs — compliments or respects; courteous attentions
- necessaries — being essential, indispensable, or requisite: a necessary part of the motor.
- condition — If you talk about the condition of a person or thing, you are talking about the state that they are in, especially how good or bad their physical state is.
- needfulness — The property of being needful or necessary.
- fundamental — serving as, or being an essential part of, a foundation or basis; basic; underlying: fundamental principles; the fundamental structure.
- lifeblood — the blood, considered as essential to maintain life: to spill one's lifeblood in war.
- necessity — something necessary or indispensable: food, shelter, and other necessities of life.
- indispensability — absolutely necessary, essential, or requisite: an indispensable member of the staff.
- must — to be obliged; be compelled: Do I have to go? I must, I suppose.
- inevitability — unable to be avoided, evaded, or escaped; certain; necessary: an inevitable conclusion.
- desiderata — something wanted or needed.
- committal — Committal is the process of officially sending someone to a prison or to hospital.