(ほんこう)

ほんこう
noun
this school; main campus
formaleducation
1. this school; our school
The school that is speaking or writing — used by a school about itself in official documents, websites, and announcements.
本校(ほんこう)歴史(れきし)
The history of our school.
At our school, uniforms are worn.
Supported by the local community, our school has reached its hundredth year.
2. main campus; main school
The principal campus of a school that also operates one or more branch campuses (分校(ぶんこう)).
本校(ほんこう)(えき)(ちか)ある
The main campus is near the station.
From next year, the branch-campus students will attend the main campus too.
The branch school up in the mountains was closed, and the children now commute to the main campus by bus every day.

Composed of (ほん) (main, this) + (こう) (school). Which sense applies depends on who is speaking: a school describing itself means sense 1; a contrast with 分校(ぶんこう) means sense 2.

Common collocations

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Sense 1 belongs to formal institutional writing — school websites, printed notices, principals' greetings. A student talking about their own school would say うちの学校(うちのがっこう) instead.