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