plumplum /plʌm/ ●●○ noun [countable] 1 a soft round usually purple fruit with a single large seed, or the tree on which it grows2something very good that other people wish they had, such as a good job, part in a play, etc.: The governorship of California is a bigger political plum than a seat in Congress.—plum adjective [only before noun]: a plum job/role/assignment