We found 18 dictionaries that define the word opportunity costs:

General (6 matching dictionaries)

1. opportunity costs: Merriam-Webster
2. opportunity costs: Collins English Dictionary
3. opportunity costs: Vocabulary.com
4. opportunity costs: Wiktionary
5. Opportunity costs: Wikipedia, the Free Encyclopedia
6. Opportunity costs: TheFreeDictionary.com

Business (8 matching dictionaries)

7. opportunity costs: Merriam-Webster Legal Dictionary
8. MoneyGlossary.com (No longer online)
9. Opportunity Costs: E-Commerce and Marketing Dictionary of Terms
10. Opportunity costs: bizterms.net
11. Opportunity costs: Bloomberg Financial Glossary
12. Opportunity costs: Harvey Financial
13. Opportunity costs: Financial dictionary
14. Opportunity costs: WashingtonPost.com: Business

Computing (1 matching dictionary)

15. Opportunity costs: Encyclopedia

Medicine (1 matching dictionary)

16. Opportunity costs: Medical dictionary

Miscellaneous (1 matching dictionary)

17. A Brief Critical Dictionary of Education (No longer online)

Science (1 matching dictionary)

18. Agricultural Thesaurus and Glossary (No longer online)

(Note: See opportunity_cost as well.)

Definitions from Wiktionary (opportunity cost) ▸ noun:  (economics) The cost of an opportunity forgone (and the loss of the benefits that could be received from that opportunity); the most valuable forgone alternative. ▸ Also see opportunity_cost ▸ Words similar to opportunity costs ▸ Usage examples for opportunity costs ▸ Idioms related to opportunity costs ▸ Wikipedia articles (New!) ▸ Words that often appear near opportunity costs ▸ Rhymes of opportunity costs ▸ Invented words related to opportunity costs