We found 25 dictionaries that define the word survival of the fittest:

General (20 matching dictionaries)

1. survival of the fittest: Longman Dictionary of Contemporary English
2. survival of the fittest: Merriam-Webster
3. survival of the fittest: Oxford Learner's Dictionaries
4. survival of the fittest: American Heritage Dictionary of the English Language
5. survival of the fittest: Collins English Dictionary
6. survival of the fittest: Vocabulary.com
7. survival of the fittest: Wordnik
8. survival of the fittest: Cambridge Advanced Learner's Dictionary
9. survival of the fittest: Wiktionary
10. survival of the fittest: The Wordsmyth English Dictionary-Thesaurus
11. survival of the fittest: Infoplease Dictionary
12. survival of the fittest: Dictionary.com
13. Survival of the Fittest (TV series), Survival of the Fittest (novel), Survival of the Fittest (song), Survival of the fittest(album), Survival of the fittest (disambiguation), Survival of the fittest: Wikipedia, the Free Encyclopedia
14. survival of the fittest: Rhymezone
15. survival of the fittest: FreeDictionary.org
16. survival of the fittest: Mnemonic Dictionary
17. survival of the fittest: TheFreeDictionary.com
18. Survival of the fittest: Phrase Finder

Business (1 matching dictionary)

19. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)

20. survival of the fittest: Encyclopedia

Medicine (1 matching dictionary)

21. survival of the fittest: Merriam-Webster Medical Dictionary

Miscellaneous (1 matching dictionary)

22. survival of the fittest: Idioms

Science (1 matching dictionary)

23. survival of the fittest: Anthropological Terms

Definitions from Wiktionary (survival of the fittest) ▸ noun:  (evolutionary theory) Natural selection. Similar: natural selection, selection, survival, evolutionary theory, fitness, sexual selection, selective advantage, Darwinism, unnatural selection, Darwinianism, more... Opposite: survival of weakest Types: natural selection, sexual selection, survival of richest, more... Phrases: Survival of the Fittest Live, more... Adjectives: evolutive, darwinian, evolutional, genealogical, evolutionary, derived, speciational, sympatric, varietal, philopatric, eugenical ▸ Words similar to survival of the fittest ▸ Usage examples for survival of the fittest ▸ Idioms related to survival of the fittest ▸ Wikipedia articles (New!) ▸ Words that often appear near survival of the fittest ▸ Rhymes of survival of the fittest ▸ Invented words related to survival of the fittest