Second entry of the subject in a fugue, usually pitched a fourth below or a fifth above the original subject. If the theme is altered slightly in the answer, then it is said to be a 'tonal' answer, if it is entirely unaltered, it is said to be a 'real' answer.
SUGGESTED LISTENING EXAMPLES:
Bach, J.S.: The Art of the Fugue, BWV 1080, Contrapunctus 1