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