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New American Oxford Dictionary

A3

A3 ▶noun a standard European size of paper, 420 × 297 mm: [ as modifier ] : A3 posters. • paper of this size: a prospectus printed on A3.

 

Oxford Dictionary

A3

A3 ▶noun [ mass noun ] a standard European size of paper, 420 × 297 mm: [ as modifier ] : A3 posters. • A3 paper: a prospectus printed on A3.