noun
union
YOO-nyuhn
noun
1
An organized group of workers formed to protect their rights and negotiate with employers.
"The union voted to go on strike over pay."
"She joined the teachers' union in her first year."
2
The act or result of joining two or more things into one.
"The treaty formed a political union between the two nations."
"Their marriage was celebrated as a union of two families."
3
In mathematics, the set containing all elements found in two or more sets.
"The union of {1,2} and {2,3} is {1,2,3}."
How to Use Union
Learner’s notesIn plain EnglishMost commonly, either a workers' organization, or the joining of two things (countries, people, sets) into one.
Common pairings
trade union
labor union
form a union
union of states
Word Forms
more union comparative, unioned past tense, unions plural, Unions plural, Unions plural, unions singular, most union superlative
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The _____ voted to go on strike over pay.
Etymology
From Old French union, from Late Latin unio ("oneness, unity"), from Latin unus ("one").