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