D defs.my
Entry 2 senses Webster, 1913

Federation

/fĕdˌ-ẽr-āsh'-ən/ · Fed·er·a·tion · IPA /ˌfɛdəˈɹeɪʃn̩/
01 n. The act of uniting in a league; confederation.
  1. 1.
    The act of uniting in a league; confederation.
  2. 2.
    A league; a confederacy; a federal or confederated government.