- (of sound reproduction) having a single channel; monaural (compare stereophonic)
- (music) having a single melodic line and no harmony (compare polyphonic)
- (orthography) having simple one-to-one mapping between letters and phonemes
1828 July 7, Peter S. Du Ponceau, “On some Points connected with the Nature of the Chinese Language (enclosure in letter from Basil Hall)”, in The Philosophical magazine, volume 5:
- 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.