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Definition of quadrillionth

quadrillionth

/kwɑːˈdrɪl.jənθ/
quad · ril · lionth
Plural:quadrillionths
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quadrillionth Lexical Profile

quadrillionth Game Scores & Validity

• noun

1

One of a quadrillion equal parts of a whole (10^-15 in the short scale).

Example

"The laser pulse lasted for only a few quadrillionths of a second."

2

The person or thing in a sequence corresponding to the number one quadrillion.

Example

"This data packet is the quadrillionth to pass through the central server."

• adjective

1

Constituting number one quadrillion in a sequence; 1,000,000,000,000,000th.

Example

"The supercomputer just completed its quadrillionth calculation of the afternoon."

2

Constituting one of a quadrillion equal parts of something.

Example

"Even a quadrillionth fraction of a gram can be detected by the new mass spectrometer."

Word Nuance & Usage

In the modern short scale (standard in the United States and contemporary British English), a quadrillionth relates to a thousand trillion (10^15); in the older British long scale, it historically referred to 10^24.

• Rhymes for quadrillionth

• Nearby Words

quadrilateral
quadrilingual
quadrillion
quadrillionth
quadriplegic
quadriplex
quadruped

Word Origin & Etymology

Formed in English from 'quadrillion' (borrowed from French, combining the Latin prefix 'quadri-' meaning 'four' with the ending of 'million') and the ordinal suffix '-th'.

Cite this Entry

Wordmom. (2026). Definition of Quadrillionth. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/quadrillionth
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