Adjective: quadrillionth
- The ordinal number of one quadrillion in counting order
"The quadrillionth calculation was completed by the quantum computer"
- One part in a quadrillion equal parts
"The device can detect one-quadrillionth of a gram";
- one-quadrillionth
Derived forms: quadrillionths
See also: ordinal
Type of: common fraction, simple fraction, vulgar fraction [Brit]
Encyclopedia: Quadrillionth