Yes, there is a plural of "series"! The word "series" refers to a group or sequence of related things that come one after the other. When we want to refer to multiple sets of series, we use the plural form "serieses" or "series".
However, it's worth mentioning that in some contexts, the word "series" can be both singular and plural. For example, "The series of books was popular" and "The series of books were popular" are both grammatically correct, although the former is more commonly used.
So, if you're referring to multiple sets of related things, go ahead and use "serieses" or "series" as the plural form. And if you're not sure which form to use, don't worry too much - either one will likely be understood by your reader or listener.
I hope that helps! Let me know if you have any further questions.
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