ISO 216 표준에 따라 정의된 210 x 297mm 크기의 표준 종이 규격.
A standard paper size defined by the ISO 216 standard, measuring 210 by 297 millimeters.
예문:
"Please print the report on A4 paper."
"The folder is designed to hold standard A4 documents."
"Most office printers use A4 as the default size."