acter

noun
act·​er | \ ˈak-tər How to pronounce acter (audio) \
plural acters

Definition of acter

: a play that has a specified number of acts used in combination Arthur Miller's two one-acters, presented under the collective title “Danger: Memory!” at the Mitzi E. Newhouse, don't amount to much.— Edith Oliver, New Yorker, 23 Feb. 1987 a two-acter

First Known Use of acter

1859, in the meaning defined above

Keep scrolling for more