しじょうくうぜん 史上空前 LinksSentence search for 史上空前Sentence search for しじょうくうぜんKanji details for 史, 上, 空 and 前Edit in JMdict Noun1. unprecedented in history; unheard-of; epoch-makingYojijukugo (four character compound) Discussions Log in to talk about this word.