[ U ] in the UK, paper that is a standard size of 42 centimetres by 59.4 centimetres（英国标准的）A2纸（42 x 59.4厘米）

[ C ] plural A2s a public exam taken in England and Wales by children aged 17 or 18. Students take AS level exams then A2s, usually a year later, which together make a full A level qualification.A2考试（英格兰和威尔士17、18岁学生参加的公共考试。学生通常在参加AS等级考试一年后参加该考试。两种考试成绩构成完整的A等级资格。）