im·mi·gra·tion /ˌɪmɪˈɡreɪʃən/ n. 1. 移居 an immigration certificate 移民证书 the immigration law 移民法 2. 〈美〉[总称](外来的)移民 A vast immigration began pouring through the city portals. 数量巨大的移民开始涌入市内。 3. 〈口〉移民局的检查 He produced his passport and transit card for immigration. 他出示护照及过境证以供移民局查验。