[ kwɒ'drɪljən ]
■ cardinal number ( plural ~s or (with numeral) same)
1》 a thousand raised to the power of five (10 15 ).
2》 dated, chiefly Brit. a thousand raised to the power of eight (10 24 ).
Derivatives
~th ordinal number .
Origin
C17: from Fr., from million , by substitution of quadri- for the initial letters.