monophonic

adjective3

1. •
   Having a single channel.
2. •
   Having a single melodic line and no harmony.
3. •
   Having simple one-to-one mapping between letters and phonemes.

   • From a similar selection, says M. Remusat, the Coreans have made a monophonic alphabet of nine vowels and fifteen consonants, with which they write their language. — 1828