Meaning10**8 · hundred millionOn'yomiオクCommon compounds (6)百億 ひゃくおく10,000,000,000; ten billion一億 いちおく100,000,000; one hundred million十億 じゅうおく1,000,000,000; billion数億年 すうおくねんseveral hundred million years億万 おくまんmillions and millions億 おくhundred million; 100,000,000; 10^8