e-la meaning

/ēˈläˈ/
noun
1. The highest note in old church music, E, the fourth space in the treble, sung to the syllable la in the highest hexachord
2. The highest pitch of anything
e-la-mi /ēˈläˈmēˈ/ noun
E, the third space in the bass (‘in bass’) or the first line in the treble (‘in alt’), sung to la in the first and fourth hexachords respectively, and mi in the second and fifth