精通（せいつう、seitsuu）
- expertise

The Japanese word 精通 (せいつう) generally means "to be well-versed in," "to be proficient in," "to have a thorough knowledge of," or "to be an expert in" something. It implies a deep understanding and skill in a particular subject, field, or area. The word often suggests not just familiarity, but also a level of mastery. The level of proficiency indicated by 精通 is typically higher than that of simple knowledge. It often emphasizes the ability to use that knowledge effectively.

⚫︎ 彼はプログラミングに精通している。 Translation: He is proficient in programming. ⚫︎ 彼女は歴史に精通しているので、歴史に関する質問に何でも答えられる。 Translation: Because she is well-versed in history, she can answer any question about history. ⚫︎ このソフトウェアは、セキュリティに精通した専門家によって設計されました。 Translation: This software was designed by an expert who is proficient in security.

⚫︎ 精通 is used to describe someone's expertise or deep understanding of a specific subject, skill, or field. ⚫︎ It is often used in formal or semi-formal contexts. ⚫︎ It can be used to describe the expertise of individuals, companies, or even systems. ⚫︎ It's common to use it with particles like "に" (ni) to indicate the area of expertise (e.g., 日本語に精通している - being proficient in Japanese).

⚫︎ The word is typically written with the kanji 精通, read as せいつう (seitsu). ⚫︎ There are no other ways to write this word. ⚫︎ There are no variations in the okurigana.

⚫︎ 詳しい (kuwashii) - detailed, knowledgeable (can be less formal than 精通). ⚫︎ 得意 (tokui) - good at, skilled in (implies a personal strength). ⚫︎ 熟知 (jukuchi) - thoroughly familiar, well-informed. ⚫︎ 造詣が深い (zoukei ga fukai) - having a deep knowledge of. ⚫︎ 堪能 (tanno) - skilled; proficient.

⚫︎ 不慣れ (funare) - unfamiliar, unaccustomed. ⚫︎ 不得手 (futokute) - not good at; weak in. ⚫︎ 素人 (shirouto) - amateur, novice. ⚫︎ 無知 (muchi) - ignorance.

彼は日本の経済に精通しており、その分野で多くの論文を発表しています。 ・Translation: He is well-versed in the Japanese economy and has published many papers in that field. ・Explanation: This sentence describes someone's expertise in a specific subject (Japanese economy) using 精通.

この会社は、最新のテクノロジーに精通したエンジニアを必要としています。 ・Translation: This company needs engineers who are proficient in the latest technology. ・Explanation: This sentence describes a requirement for engineers with a deep understanding of cutting-edge technology using 精通.

The kanji 精 (sei) means "refined," "pure," or "detailed." The kanji 通 (tsuu) means "to pass through," "to be well-versed," or "to be an expert." Thus, 精通 implies a "thorough understanding" achieved through a "passing through" or processing of information and experience, resulting in a refined and deep knowledge.