This is the 510th most frequent Czech word.
série
Series.
In this sentence, 'série' refers to a set or collection of books that are part of a unified sequence.
Tato série knih je velmi populární.
This series of books is very popular.
In this context, 'série' is used to detail a successive set of sporting events, typically competitive matches.
Sportovní tým prohrál sérii finálových zápasů.
The sports team lost the series of final matches.
Here, 'série' describes a sequence of episodes within a television program focusing on a single theme or storyline.