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noun

a standard paper size, 210 × 297 mm
(as adjective): an A4 book

See also A sizes
Contemporary Examples

May 4, 2009 – 4:07 p.m. Type: TEL Subject: Suspicious activity Report: Reports a blue Audi a4 15.
George Zimmerman’s History of 911 Calls: A Complete Log Matthew DeLuca March 21, 2012

a4 involved Karun being marooned in Bandra by accident, not design.
A Mathematically Impossible Novel: Manil Suri Explains “The City of Devi” Manil Suri March 14, 2013

A1 was too sci-fi, a4 not dramatic enough, so I could simply terminate these threads.
A Mathematically Impossible Novel: Manil Suri Explains “The City of Devi” Manil Suri March 14, 2013

Historical Examples

Passing over the cycle coefficient in A3 for the present, it is clear that the katun coefficient in a4 is 19.
An Introduction to the Study of the Maya Hieroglyphs Sylvanus Griswold Morley

The combination of the two gives the head in a4 the value of 19.
An Introduction to the Study of the Maya Hieroglyphs Sylvanus Griswold Morley

This, of course, is likewise the case, if the verses are broken up into stanzas by inserted rhyme (a4 b3 a4 b3).
A History of English Versification Jakob Schipper

In a4 10 tuns are very clearly recorded; note the fleshless lower jaw of the tun head.
An Introduction to the Study of the Maya Hieroglyphs Sylvanus Griswold Morley

Comparing the glyph in a4 with the sign for Manik in figure 16, j, the two forms are seen to be identical.
An Introduction to the Study of the Maya Hieroglyphs Sylvanus Griswold Morley

But this date is not repeated in a4, where the terminal date of this Secondary Series, 0.0, seems to be recorded.
An Introduction to the Study of the Maya Hieroglyphs Sylvanus Griswold Morley

The student may apply a check at this point to his identification of the day sign in a4 as being that for the day Eb.
An Introduction to the Study of the Maya Hieroglyphs Sylvanus Griswold Morley