Ppb

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Initialism of parts per billion. abbreviation, alt-of, initialism, plural, plural-only
  2. 2
    Initialism of production-possibility boundary. abbreviation, alt-of, initialism
  3. 3
    Initialism of parts per billion. abbreviation, alt-of, initialism

    "The International Organization for Standardization (ISO)² does not accept the common use of parts per billion (ppb) for two reasons: the meaning of billion is ambiguous, and parts is also ambiguous because it could refer to volume, mass, number, or some other measure."

Synonyms

All synonyms
nuppcppf

Example

More examples

"The International Organization for Standardization (ISO)² does not accept the common use of parts per billion (ppb) for two reasons: the meaning of billion is ambiguous, and parts is also ambiguous because it could refer to volume, mass, number, or some other measure."

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.