Fugue

Fugue	an imitative contrapuntal composition that develops a theme Fugues usually incorporate three or four voices which enter one by one.
Subject (S)	the recurring theme of a fugue The subject is stated at the very beginning of a fugue, usually unaccompanied.
Answer (A)	the second (and sometimes fourth) statement of the subject transposed to the dominant (up a perfect 5th or down a perfect 4th)
Real Answer Tonal Answer	an exact transposition of the subject a transposed subject which is altered to maintain the tonic key
Countersubject (CS)	the theme which regularly accompanies the subject Countersubjects usually follow the initial subject statement in the same voice and therefore first accompany the answer.
Exposition	a section in which the complete subject appears, particularly the initial section which introduces the subject successively in each voice
Bridge	(a.k.a. link or codetta) a short passage in the exposition which links entries of the subject
Episode	a section which does not include the complete subject Episodes often employ sequences or stretto.
Sequence	a technique in which a motive or short figure is successively stated, the motive being transposed by equidistant intervals
Stretto	the introduction of two or more entries of the subject at a closer time-interval than that of the exposition to heighten the dramatic effect
False Entry	an incomplete subject entry often used in stretto
Double Fugue	a fugue which develops two subjects
Triple Fugue	a fugue which develops three subjects