/ɪˈrekʃn ||; ɪˈrɛkʃən/noun1 [C] if a man has an erection, his sexual organ (penis) becomes hard and stands up because he is sexually excited. （阴茎的）勃起: to get/have an erection 勃起
2 [U] (formal 正式) the act of building sth or standing sth straight up 建造；竖立