(informal, only in combination) A work in a specified number of parts.
The show was a two-parter, but we stopped watching halfway through.
noun
(rare) That which parts, or draws apart.
When you run out of original ideas in Hollywood, you call in the makers of thunder and lightning and, if the film is biblical, the parters of the Red Sea and the choirs of heavenly angels humming to the strings of Mantovani.
(archaic, slang) One who readily parts with money; a free spender.