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