A3

noun

A one-page document, often tabular or graphical, on such paper.

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Meanings

nounA3 (usually uncountable, plural A3s)

plural A3s

  1. countableusuallymanagementA one-page document, often tabular or graphical, on such paper.
  2. UKuncountableusuallyrail transportA3 class, a class of steam locomotive used on the London and North Eastern Railway.

Origin

See the Wikipedia article ISO 216, the international standard on paper sizes.

Full word history & related roots →
Cite this entry
APA

A3. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/A3

MLA

“A3.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/A3. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “A3,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/A3.

Source: A3 on Wiktionary, CC BY-SA 4.0.