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