Adjective
English Wikipedia has an article on:microtonal musicWikipedia
microtonal (comparative more microtonal, superlative most microtonal)
(music) Of, relating to, or written using microtones.
Some sources state that the term blues is related to " blue notes ", the flatted, often microtonal notes used in blues, but the Oxford English Dictionary claims that the term blues came first and led to the naming of "blue notes". Source: Internet
While in equal temperament scales, enharmonics are notes with identical pitch but different spellings (e.g. A♭ and G♯); in flamenco, as in unequal temperament scales, there is a microtonal intervalic difference between enharmonic notes. Source: Internet
Microtonal scales The term microtonal music usually refers to music with roots in traditional Western music that uses non-standard scales or scale intervals. Source: Internet
Special fingerings may be used to play quarter tones and other microtonal intervals. Source: Internet
This new class of instruments, microtonal by nature, was only adopted slowly by composers at first, but by the early 1930s there was a burst of new works incorporating these and other electronic instruments. Source: Internet