We found 13 dictionaries that define the word labor unions:

General (7 matching dictionaries)

1. labor unions: Merriam-Webster
2. labor unions: Collins English Dictionary
3. labor unions: Vocabulary.com
4. Labor-Unions, labor-unions: Wordnik
5. labor unions: Cambridge Advanced Learner's Dictionary
6. labor unions: Wiktionary
7. Labor-unions, Labor unions: Wikipedia, the Free Encyclopedia

Business (2 matching dictionaries)

8. labor unions: Merriam-Webster Legal Dictionary
9. Labor unions: Legal dictionary

Computing (1 matching dictionary)

10. Labor unions: Encyclopedia

Medicine (1 matching dictionary)

11. Medical Dictionary (No longer online)

Science (1 matching dictionary)

12. Agricultural Thesaurus and Glossary (No longer online)

Slang (1 matching dictionary)

13. labor unions: Urban Dictionary

(Note: See labor_union as well.)

Definitions from Wiktionary (labor union) ▸ noun:  (Canada, US) A continuous association of wage-earners for the purpose of maintaining or improving the conditions of their employment; a trade union. ▸ Also see labor_union Opposite: management, employers, businesses Phrases: Labor unions in the United States, Labor unions in Japan, Federation of Organized Trades and Labor Unions, more... ▸ Words similar to labor unions ▸ Usage examples for labor unions ▸ Idioms related to labor unions ▸ Wikipedia articles (New!) ▸ Words that often appear near labor unions ▸ Rhymes of labor unions ▸ Invented words related to labor unions