se·ries 
/ˈsiriz/ noun
plural series /ˈsiriz/ noun [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
▪ 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
▪ 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
in series
: one after the other in a particular order
▪ She placed the items in series.
▪ She placed the items in series.
