sub·​se·​ries | \ ˈsəb-ˌsir-(ˌ)ēz How to pronounce subseries (audio) \
variants: or sub-series
plural subseries or sub-series

Definition of subseries

: a series that is part of a larger series … a full relaunch of the flagship series, including a subseries devoted entirely to Kevin Keller, the first openly gay character written for the comics.The Georgetown Voice The best way to think of Trails is as a collection of three sub-series. Each of these sub-series is set in a different country, and there are plenty of references and character crossovers, but you can play each one on its own.— Jason Schreier

First Known Use of subseries

1821, in the meaning defined above

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The first known use of subseries was in 1821

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