professional² n [C] 1 someone who works in a job that needs special education and training 专业人士,专家: a health care professional 专业保健人员 2 someone who earns money by doing a sport or activity that other people do for enjoyment 把〔别人通常作为消遣的活动〕作为职业的人; 职业选手 → compare 比较 AMATEUR²