世界初 せかいはつ Meanings の-adjective, Noun world's first; first in the world Kanji 世 world. Read as セ. 界 realm. Read as カイ. 初 first. Read as はつ. Example sentences 世界初の人工衛星はスプートニク1号で、ロシアにより1957年に打ち上げられた。The first artificial satellite was Sputnik 1, launched by Russia in 1957. Jinuma: Japanese Dictionary · Word lists