subseries
noun
sub·se·ries
| \ ˈsəb-ˌsir-(ˌ)ēz
\
\
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
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