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