| Term | Definition |
| polyphonic vocal genre, secular in middle ages but sacred or devotional thereafter | motet |
| fixed melody usually of very notes, often based on fragment of Gregorian chant that served as structural basis for polyphonic composition | cantus firmus |
| male voice of high range. Also a part often structural, in polyphony | tenor |
| second voice of polyphonic work, especially the medieval motet | duplum |
| third voice in early polyphony | triplum |
| 2 or more texts set simultaneously in a composition | polytextuality |
| a short melodic, rhythmic, or harmonic patter that is repeated throughout a work or a section of one | ostinato |
| melodic idea presented in one voice and then restated in another, each part continuing as other neter | imitation |
| texture comprised of chords in which the pitches sound simultaneously | chordal declamation |
| choral music performed without instrumental accompaniment | a capella |
| central service of Roman catholic church | mass |
| lord. section of ordinary of mass which follows introit. It has 3 parts, kyrie eleison, christe eleison, kyrie eleison. In medieval times Kyrie was set as an independent movement | Kyrie |
| section of mass. 2nd musical movement of ordinary | Gloria |
| section of mass. 3rd musical movement of ordinary | Credo |
| section of mass. 4rd musical movement of ordinary | Sanctus |
| section of mass. last musical movement of ordinary | Agnus Dei |