(こうしき)

こうしき
noun, na-adjective
official; formula
1. official, formal
Publicly recognized or authorized; relating to an official capacity or position.
これ公式(こうしき)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)三千人(さんぜんにん)()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.

TWO DISTINCT MEANINGS:
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)

[Register: Neutral to Formal]