[count] 1 : a number of things or events that are arranged or happen one after the other —usually singular ▪ the summer concert series at the park —often + of ▪ a series of experiments/explosions ▪ We've had a series of problems with our computer network. ▪ an unusual series of events
2 a : a set of regularly presented television shows involving the same group of characters or the same subject ▪ a popular television series ▪ a five-part series on/about the history of baseball b : a set of books, articles, etc., that involve the same group of characters or the same subject ▪ a comic book series ▪ a series of articles on global warming
3 sports : a set of games that are played between two teams one after the other on different days ▪ The Yankees played a three-game series against the Red Sox last week. ▪ The play-off series between the two teams begins next week. —see also world series