w/o

noun

weight-percent (percentage calculated by relative mass)

“w/o January 7th”

Similar
%mass%weightwt%%w/w%m/m
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Meanings

verb
  1. abbreviationbusinessAbbreviation of write off.
nounw/o (plural not attested)
  1. abbreviationno pluralhobbiesAbbreviation of walkover.
  2. abbreviationno pluralschedulingAbbreviation of week of.

    w/o January 7th

  3. abbreviationno pluralbusinessAbbreviation of write-off.
  4. no pluralchemistryweight-percent (percentage calculated by relative mass)

    ZrO₂ + 46 w/o UO₂ + 5 w/o Fe

    Synonyms: %mass, %weight, wt%, %w/w, %m/m

  5. abbreviationno pluralAbbreviation of week(s) old.
  6. abbreviationno pluralAbbreviation of wife of.

    Sandy Steven, w/o Steven

adjective
  1. abbreviationchemistryAbbreviation of emulsion of water in oil.
adverbw/o (not comparable)
  1. abbreviationnot comparableAbbreviation of without.

    Once more significant differences were observed for CTR w/o LIF. (E)- Protein levels for Hexokinase I and II, GAPDH and PKM1/2 were determined by western Blot and quantified by densiometric evaluation.

    2015 July 6, “Dichloroacetate, the Pyruvate Dehydrogenase Complex and the Modulation of mESC Pluripotency”, in PLOS ONE, →DOI

Synonyms & antonyms

nounweight-percent (percentage calculated by relative mass)

Similar
%mass%weightwt%%w/w%m/m
Also see
withoutwt%
Cite this entry
APA

w/o. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/w%2Fo

MLA

“w/o.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/w%2Fo. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “w/o,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/w%2Fo.

Source: w/o on Wiktionary, CC BY-SA 4.0.