Monaural or monophonic; having only a single audio channel.
Monochrome.
Monosexual.
Monoamorous, monogamous.
A monogamous person.
A bicycle or motorcycle trick where the front wheel is lifted off the ground while riding
having a single channel; monaural (compare stereophonic)
having simple one-to-one mapping between letters and phonemes
having a single melodic line and no harmony (compare polyphonic)