noun
major label debut
Refers to an artist's first release on a major record label, as opposed to an indie debut. Wasei-eigo; the English equivalent is simply 'major debut' or 'major label debut'.
wasei-eigo (Japanese-coined English), from major debut
彼女のバンドは来年メジャーデビューする予定だ。
Her band is scheduled to make their major label debut next year.
メジャーデビューシングルがオリコン1位を獲得
Their major debut single reached number one on the Oricon chart.