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English Lexicon

A4

/ˌeɪˈfɔːr/
nounadjectiveCEFR B1 (Intermediate)Top #4500 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    A standard international paper size measuring 210 by 297 millimeters (8.27 by 11.69 inches), widely used for writing, printing, and office documents.

    "Please print the final report on standard A4 paper."
As adjective
  1. 1

    Designating paper or a document format of the standard A4 size.

    "Make sure you use A4 notebooks for all your lectures."
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Linguistic Origin & Historical Etymology

Derived from the ISO 216 international standard for paper sizes, established in 1975 based on earlier German DIN 476 standards from 1922. The letter 'A' designates the primary series of paper formats, and the number '4' indicates that the sheet is obtained by halving an A3 sheet four times from the base A0 area of one square meter.

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