IPA: /ˌsɛmɪˈtɒnɪk/
KK: /sɛmɪˈtɑnɪk/
Relating to a musical interval that is one half step, or semitone, apart.
The semitonic scale is often used in various musical compositions to create tension.
Semitonic → It is formed from "semi-" (meaning half) and "tonic" (from Greek "tonikos", meaning relating to tension or tone). The word "semitonic" refers to something that is half of a tone or related to a half-step in music.
Think of 'semi-' meaning half and 'tonic' relating to tone — so semitonic refers to something that is half a tone.