a/o

noun

atomic percent (percent calculated by number of atoms)

“a Pu-Fe eutectic mixture (9.5 a/o Fe)”

Similar
m/oat%
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Meanings

nouna/o (uncountable)
  1. physicaluncountablechemistryatomic percent (percent calculated by number of atoms)

    a Pu-Fe eutectic mixture (9.5 a/o Fe)

    Synonyms: m/o, at%

Synonyms & antonyms

nounatomic percent (percent calculated by number of atoms)

Similar
m/oat%
Also see
at%m/o

Origin

A typescript approximation of a percent sign % with the top zero replaced with 'a' for atom.

Full word history & related roots →
Cite this entry
APA

a/o. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/a%2Fo

MLA

“a/o.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/a%2Fo. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “a/o,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/a%2Fo.

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