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Adjective: quadrillionth
  1. The ordinal number of one quadrillion in counting order
    "The quadrillionth calculation was completed by the quantum computer"
Noun: quadrillionth
  1. 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