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The word "non-optional" is correct and usable in written English.
It is a combination of two adjectives, "non" and "optional," and it means "mandatory" or "obligatory." For example, you can use the word in a sentence like this: "All students are required to complete the non-optional final exam."
Exact(24)
As with no-frills airlines' websites, all sorts of non-optional extras, such as port taxes, can appear at checkout.
The more romantically inclined expect something out of Chariots of Fire - dashing young gents with side partings squaring-off in a heroic duel (mist-fringed spires non-optional).
The following advice is fairly rote by now, but it does not make it less true: the inevitability of having a password stolen makes a password manager like LastPass or 1Password a non-optional piece of software.
The Advertising Standards Authority (ASA) says all non-optional charges should be included in or alongside the advertised price on a website, and it has been conducting enforcement work since September to make sure that ticket sellers are up front about compulsory admin fees to avoid misleading consumers.
It is virtually an article of faith among some fusioneers that creating miniature stars on Earth is a non-optional part of humanity's future a view that mirrors arguments put forth by a growing number of environmentalists who once decried nuclear power.
It is virtually an article of faith among some fusioneers that creating miniature stars on Earth is a non-optional part of humanity's future — a view that mirrors arguments put forth by a growing number of environmentalists who once decried nuclear power.
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I agree with most everything in John Podhoretz's dyspeptic assessment of the Republican field, but I balked at this part: Perry's refusal to pick and choose with his non-flat, optional "flat tax" constitutes an act of egregious cynicism.
Finally, we present some non-exhaustive optional elements within this framework that a country could consider to successfully operationalise and implement its REDD+ NFI.
1) Extension Options Three optional and non-exclusive strategies can be used to extend the discovered biclusters such that the resulting solution still satisfies some pre-defined homogeneity criteria.
Thus was the debate dumped on to ABC's affiliates for optional non-prime-time airings and to C-Span the next day, where it was rerun repeatedly.
"Compromise agreements are recognised by statute, and the standard form of severance agreement from Acas includes an optional non-disclosure and confidentiality clause," he said.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com