In a microtone, how is the interval defined?

A microtone is defined as an interval that is smaller than a semitone. This means that it can encompass any pitch difference that doesn't adhere to the traditional Western tuning system, which divides an octave into 12 equal semitones. Microtones can feature intervals such as quarter tones or even smaller subdivisions of the standard pitches, allowing for a richer variety of sounds and more nuanced expression in music. This characteristic sets microtonal music apart from typical scales based on semitones, enabling composers and performers to explore a broader palette of sonic possibilities.