Wikipedia
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A maxi single or maxi-single (sometimes abbreviated to CDM) is a music single release with more than the usual two tracks (generally an a-side song and a b-side song).
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Yeah, I'd assume it was any single with more than two tracks. I.E. Together When... is a regular single. but Rule/Sparkle is a maxi single, so is HEAVEN, or really any single that has a B side, or focuses on more than one song.
Which (off the top of my head) is every ayu single besides Together When..., and her early singles from ASFXX.