Definitions of series:

• noun:   (mathematics) the sum of a finite or infinite sequence of expressions
• noun:   a periodical that appears at scheduled times
• noun:   (sports) several contests played successively by the same teams

  Example: "The visiting team swept the series"

• noun:   similar things placed in order or happening one after another

  Example: "They were investigating a series of bank robberies"

• noun:   a group of postage stamps having a common theme or a group of coins or currency selected as a group for study or collection

  Example: "The Post Office issued a series commemorating famous American entertainers"

• noun:   (electronics) connection of components in such a manner that current flows first through one and then through the other

  Example: "The voltage divider consisted of a series of fixed resistors"

• noun:   a serialized set of programs

  Example: "A comedy series"