What's the plural form of fortition? Here's the word you're looking for.
Answer
The noun fortition can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be fortition.
However, in more specific contexts, the plural form can also be fortitions e.g. in reference to various types of fortitions
or a collection of fortitions.
Examples
The development of stop gradation can be viewed either as a process of fortition or a process of lenition.
The specific historical changes are either through lenition or fortition.