imperfectum
Imperfectum (Latin "unfinished" or "incomplete") may mean:
Imperfect, a verb form
Opus Imperfectum, an early Christian commentary on the Gospel of Matthew
in the Middle Age theory of music
for tempi - tempus imperfectum and tempus imperfectum diminutum - see Mensural notation
for consonances see Consonance and dissonance#Antiquity and the middle ages
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