Abbreviation of 私立学校 (しりつがっこう). Used in contexts where the full term is understood, such as school names or casual conversation.
See also: 私立学校
He attends a private school.
There are few private schools in this area.
Abbreviation of 公立学校 (public school). Contrasts with 私立校.
Abbreviation of 私立学校 (しりつがっこう), literally 'privately established school'.