What's the plural form of noncollinearity? Here's the word you're looking for.
Answer
The noun noncollinearity can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be noncollinearity.
However, in more specific contexts, the plural form can also be noncollinearities e.g. in reference to various types of noncollinearities
or a collection of noncollinearities.