rhap·so·dy [rap-suh-dee]: noun, plural -dies. 1. Music . an instrumental composition irregular in form and suggestive of improvisation. 2. an ecstatic expression of feeling or enthusiasm. 3. an epic poem, or a part of such a poem, as a book of the Iliad, suitable for recitation at one time. 4. a similar piece of modern literature. 5. an unusually intense or irregular poem or piece of prose. 6. aka life of amie