Definition of “series” - Learner’s Dictionary

series

noun [ C ] us uk /ˈsɪəriːz/ plural series
SAME THINGS

B2 several things or events of the same type that come one after the other:

a series of lectures

More examples

TELEVISION/RADIO

B1 a group of television or radio programmes that have the same main characters or deal with the same subject:

a four-part drama series

(Definition of “series” from the Cambridge Learner's Dictionary © Cambridge University Press)