公式(こうしき)

こうしき
noun, na-adjective
official; formula
formaleducation
1. official, formal
Publicly recognized or authorized; relating to an official capacity or position.
これは公式(こうしき)な発表(はっぴょう)です。
This is an official announcement.
You can check detailed information on the official website.
公式(こうしき)サイト is a very common expression
公式(こうしき)記録(きろく)によると、参加者(さんかしゃ)は三千人(さんぜんにん)を超(こ)えた。
According to official records, the number of participants exceeded three thousand.
2. formula (mathematics)
A mathematical rule or relationship expressed in symbols.
Memorizing mathematical formulas is difficult.
You can calculate the area using this formula.
In physics exams, it's important to apply the formulas correctly.

Usage

1. As na-adjective: official, formal (公式(こうしき)な〜)
2. As noun: mathematical formula

Common expressions

Opposite: 非公式(ひこうしき) (unofficial, informal)