series

series /ˈsiriz/ noun
plural series
series
/ˈsiriz/
noun
plural series
Britannica Dictionary definition of SERIES
[count]
1 
: a number of things or events that are arranged or happen one after the other — usually singular — often + of
2 
a  : a set of regularly presented television shows involving the same group of characters or the same subject
b  : a set of books, articles, etc., that involve the same group of characters or the same subject
3 
sports : a set of games that are played between two teams one after the other on different days
— see also world series

in series

: one after the other in a particular order