Doing a series, every week you work with a new star.

I have done a series in the '60s, '70s and '80s.

A pure mathematical series would be one in which each term is derived from the preceding term by a rule.

Outside speech, the association that is made in the memory between words having something in common creates different groups, series, families, within which very diverse relations obtain but belonging to a single category: these are associative relations.