Definition from macmillandictionary.com
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We’ll need to do a series of tests before we do anything else.
a strange series of events leading up to the murder
a hit television series
Tonight’s programme is the second in a three-part series.
a popular new series of children’s books
Terry’s BMW was one of the Series 3 models.
The team were preparing for the series against England.
a Test series (=an international cricket competition)