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