What is another word for sine qua non?

Need synonyms for sine qua non? Here's a list of similar words from our thesaurus that you can use instead.

Noun
An essential or indispensable element, condition, or ingredient
“Fortuitously initiated development is a condition sine qua non of Darwinism and Weismannism.”
Noun
(usually used in plural form "essentials") A fundamental element or characteristic
Noun
A pin inserted through holes at the end of an axle, so as to secure a wheel
Noun
Something that is wished for, or considered desirable
Noun
Indispensable content
Noun
A pressing requirement
Adjective
Nonnegotiable or firm
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