A8 Definition
noun
A standard paper size, defined by ISO 216 as having dimensions 74 x 53 mm (74.325 x 52.556 mm)
Wiktionary
(as a modifier) Describing paper of that size.
A sheet of A8 paper.
Wiktionary
pronoun
A standard paper size, defined by ISO 216 as having dimensions 74 x 53 mm (74.325 x 52.556 mm)