octillion noun.
[ɒk'tɪljǝn] L17.[from OCTA- after million, billion, etc.]Orig. (esp. in the UK), the eighth power of a million (10
48). Now usu. (orig.
US), the ninth power of a thousand (10
27).
■ octillionth adjective & noun M19. [TahlilGaran] English Dictionary ▲