ppb

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PPB^¹

noun

abbreviation, initialism, plural, plural only Initialism of parts per billion

PPB^²

noun PPBs

abbreviation, initialism Initialism of production-possibility boundary
Similar: PPC, PPF

ppb^³

noun ppb

abbreviation, initialism Initialism of parts per billion 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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MLA

"ppb." Wiktionary, via Micwyn, micwyn.com/word/ppb. Accessed 6 Nov. 2026.

APA

ppb. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/ppb

Chicago

"ppb." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/ppb.

BibTeX

@misc{ppb_2026,
  title = {ppb},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/ppb},
  urldate = {2026-11-06}
}

ppb