septillion

 
Pronunciation: /sɛpˈtɪljən/

cardinal number (plural septillions or (with numeral) )

  • a thousand raised to the eighth power (1024).
  • dated, chiefly British a million raised to the seventh power (1042).

Origin:

late 17th century: from French, from million, by substitution of the prefix septi- 'seven' (from Latin septimus 'seventh') for the initial letters