The phrase "ongoing series" refers to a TV show, book, or any form of media that is currently being continuously released or broadcasted with no definitive end. It means there will be more episodes or installments in the future. Full definition
On view are more of the artist's ongoing series of body prints, for which she covers herself in oil paint before pressing against a canvas on the floor. (miandn.com)
I received a great number of free downloads, giving me a substantial return on my investment in ongoing series sales. (bookshark.org)
Frankly, traditional publishing has become mediocre at launching new brand - name authors, especially with ongoing series. (blog.reedsy.com)