A4

Etymology
Specified in of 1975, based on, a German standardisation of 1921.

Proper noun

 * 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.
 * 1)  A4 class, a class of steam locomotive used on the London and North Eastern Railway.

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

Noun

 * 1)  a standard paper size, defined by ISO 216.
 * dimensions: 210 x 297 mm

Adjective

 * 1)  being the typical, what one would expect, without deviating from the norm

Adjective

 * 1)  A standard paper paper size that's in common use
 * 2) Being the typical, what one would expect, without deviating from the norm, average.

Etymology
From.

Adverb

 * 1)  doggy style