D defs.my
Entry 1 sense Webster, 1913

Immigration

/ĭmˌ-əg-rāsh'-ən/ · Im·mi·gra·tion · IPA /ˌɪmɪˈɡɹeɪʃən/
01 n. The act of immigrating; the passing or coming into a country for the purpose of permanent residence.
  1. 1.
    The act of immigrating; the passing or coming into a country for the purpose of permanent residence.
    “The immigrations of the Arabians into Europe.” — T. Warton.