n a systematic interpretation or explanation (usually written) of a specific topic
n a collection of things (goods or works of art etc.) for public display
n an account that sets forth the meaning or intent of a writing or discourse
we would have understood the play better if there had been some initial exposition of the background
n (music) the section of a movement (especially in sonata form) where the major musical themes first occur
n a form of behavior therapy in which a survivor confronts feelings or phobias or anxieties about a traumatic event and relives it in the therapy situation