Definition

Noun 1. A fractional part equal to one of one hundred million equal parts of a whole: This is a precise mathematical term denoting the fraction 1/100,000,000. It represents a single unit when something is divided into one hundred million identical parts.

Usage

This term is primarily used in contexts requiring extreme precision, often in mathematics, science, statistics, and engineering to describe very small proportions, probabilities, or measurements.

Examples

• The margin of error in the experiment was less than one-hundred-millionth.
• The new sensor can detect a change in pressure of one-hundred-millionth of an atmosphere.
• The probability of that event occurring randomly is about one-hundred-millionth.

Advanced Usage

• Used as a quantifier or measurement unit in technical fields.
  • The impurity concentration was measured at a few one-hundred-millionths.
• Can be used in its numerical decimal form (0.00000001) or percentage form (0.000001%).

Variants and Related Words

• 100-millionth: An alternative numerical form with the same meaning.
• Hundred-millionth: A common written form without the hyphen.
• 1e-8 or 1 × 10⁻⁸: Scientific notation for one-hundred-millionth.

Synonyms

• 1/100,000,000: The fractional notation.
• 0.00000001: The decimal notation.

Notes

This is a compound numerical term. Its meaning is strictly mathematical and does not have idiomatic uses or phrasal verbs. It functions as a specific determiner for nouns representing units (e.g., one-hundred-millionth of a second, one-hundred-millionth of a gram).

Noun

1. one part in a hundred million equal parts