What does 形成 mean?
形成 is a Japanese noun meaning “formation” in English. It can also be translated as “repair (e.g. with plastic surgery)” depending on context. It is written as 形成 in kanji, けいせい in hiragana, and keisei in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
世界の熱帯雨林は、この惑星上の生命が形成する生態学的な連鎖の中で、かけがえのない環をなしているのである。
The world's tropical rainforests are critical links in the ecological chain of life on the planet.