• (RP) IPA: /ɪˈɹɛlətɪv/
• (GA) IPA: /ɪˈɹɛlətɪv/, [-ɾɪv]

irrelative

1. Having no relations to each other; unrelated.
2. Not related#Adjective|related to the subject#Noun|subject at hand; irrelevant.
   • 1934, F[rancis] Scott Fitzgerald, Tender is the Night: A Romance, New York, N.Y.: Charles Scribner’s Sons, OCLC 284462 ↗; republished as chapter 7, in Tender is the Night, New York, N.Y.: Charles Scribner’s Sons, 1962, OCLC 909408882 ↗, page 42 ↗:

     When the subject of Mr. Denby fell of its own weight, he essayed other equally irrelative themes, but each time the very deference of Dick's attention seemed to paralyze him, and after a moment's stark pause the conversation that he had interrupted would go on without him.

3. (music) Describing two or more chords which do not share#Verb|share any note#Noun|notes in common.

   Irrelative chords in music are those having no common tone.