公式|こうしきkoushiki[0]heiban (flat)
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- no-adjective, noun (suffix)official; formal
- nounformula (e.g. mathematical)
- noun, noun (suffix)official (social media) account (of a company, organization, etc.)
- Antonym非公式ひこうしきNeutral「非公式」 means informal or unofficial — the direct opposite of 「公式」, as in 「非公式会談」.
- Antonym内々うちうちNeutral「内々」 refers to private, internal matters kept within a small circle, contrasting with the public nature of 「公式」, as in 「内々に知らせる」.
Use 「公式」 for official or formal things and for mathematical formulas, as in 「公式発表」 and 「公式サイト」. The opposite is 「非公式」; for private, internal matters say 「内々」.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only


