light opera; operetta
Refers to a genre of opera that is light in tone, often with spoken dialogue, similar to operetta.
She played the lead role in a light opera production.
A light opera will be performed at this theater next month.
歌劇 means 'opera' in general, whereas 軽歌劇 specifically refers to a lighter, often comedic form.
Compound of 軽 (light) and 歌劇 (opera), likely a calque from Western 'light opera' or 'operetta'.