distinctio
noun
dis·tinc·tio
də̇ˈstiŋ(k)t(s)ēˌō,
-)shēˌō
variants or less commonly distinction
-)shən 
plural distinctiones
⸗ˌ⸗tsēˈōˌnās,
-shēˈōˌnēz
also distinctions -shənz
: a phrase in a Gregorian melody indicated by markings in the text
Word History
Etymology
Medieval Latin distinction-, distinctio section, division, from Latin