Of, relating to, or written using microtones.(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "microtonal" in a sentence
"Speaking as an on-again-off-again microtonal composer, the Sims in particular seemed well rehearsed; perhaps the strings 'reduction to around a dozen helped."
"But the other main musical issue is that in Indian music, you have this very complicated system, or complex system, I should say, of ornamentation that, again in the West, it's kind of glossed over by being referred to as microtonal or quarter tones, and it's much more complex than that."
"Taking full advantage of the udderbot's tonal capacity, the majority of music on the program is "microtonal", i.e. using notes and intervals that fall "between the keys" of the piano."