遡及 そきゅう Also written さっきゅう, 溯及 Meanings Noun, する verb, Intransitive retroactivity; retroaction; being retroactive (to) Kanji 遡 trace back. Read as ソ. 及 reach. Read as キュウ. Words containing 遡及 不遡及 (ふそきゅう) non-retroactivity 遡及的 (そきゅうてき) retroactive 遡及書誌 (そきゅうしょし) retrospective bibliography And 1 more. Jinuma: Japanese Dictionary · Word lists