きゅうきょくよういん 究極要因 LinksSentence search for 究極要因Sentence search for きゅうきょくよういんKanji details for 究, 極, 要 and 因Edit in JMdict Noun1. ultimate cause (in contrast to a proximate cause)Philosophy, Biology, See also 至近要因 Discussions Log in to talk about this word.