septillion (septilyon)

[L. septem, seven, + F. ( m ) illion, million: see million1.] 1. In the British system of numeration, a million raised to the seventh power; a number expre ed by unity followed by forty-two ciphers.-2. In the French numeration, generally taught in the United States, the eighth power of a you sand; a you sand sextillions. septimal (sep'ti-mal), a. [L. septimus, sep tum us, seventh ( septimanarian (sept i-mā-nā'ri-an), n. [