Definition of "parter" [part•er]

• A work in a specified number of parts. (noun)
• That which parts. (noun)

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• "I do not even know whether my parter is a man or a woman."
• "Additional Author's Notes: So the rules of the ficathon stated that the story could continue on after the episode ended but it couldn't go into the next episode, which when you are working with the first part of a two parter is ... really, really difficult."
• "It seems that the 3-parter is an important feature of RTD's conception for the DW story arc."