- the number represented by 1 followed by 15 zeros
- Brit. the number represented by 1 followed by 24 zeros
Origin of quadrillionFrench ; from quadri- (see quadri-) + (mi)llion
- The cardinal number equal to 1015.
- Chiefly British The cardinal number equal to 1024.
Origin of quadrillionquadr(i)– + (m)illion.
- (figuratively, slang) Any very large number, exceeding normal description.