English

Noun

A4 ‎(uncountable)

1. A standard paper size, defined by ISO 216.

   dimensions: 210 x 297 mm

   • 2001 — Eoin Colfer, Artemis Fowl, p 66

     "There are preparations to be made for our guest's arrival," said Artemis, handing a typewritten sheet of A4 to Juliet.

See also

• (A paper sizes): 2A0   A0   A1   A2   A3   A4   A5   A6   A7   A8   A9   A10

Etymology 2

Proper noun

A4

1. one in a series of alphanumerics used in many national road systems.

   The A4, which runs from London to Bristol, used to be known as the Great West Road.

2. (Britain, rail transport) A4 class, a class of steam locomotive used on the London and North Eastern Railway.

Mandarin

Romanization

a4 (Zhuyin ㄚˋ)

1. Alternative spelling of à