最長さいちょう Common Noun Noun English jmdict 1 nouns which may take the genitive case particle 'no'noun (common) (futsuumeishi) longest Antonym: 最短 (さいたん) 世界最長なのです。 It is the longest in the world. 2 nouns which may take the genitive case particle 'no'noun (common) (futsuumeishi) oldest Antonym: 最少 (さいしょう)