union

Meanings

1. 1
   noun

   An organized group of workers formed to protect their rights and bargain with employers.

   You have to join the union in order to get a job.

2. 2
   noun

   A group of states, people, or organizations joined together as one.

   The union between the conservatives and the liberals did not last long.

3. 3
   noun

   The act of joining two or more things into one.

   The union of the two companies created a powerful new firm.

4. 4
   noun

   In mathematics, a set containing all the members of two or more sets.

   Let C be the union of the sets A and B.

From Middle English unyoun, from Old French union, from Late Latin ūniō, ūniōnem (“oneness, unity”), from Latin ūnus (“one”). Doublet of unio.

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