We found 19 dictionaries that define the word oldest:

General (15 matching dictionaries)

1. oldest: Merriam-Webster
2. oldest: Oxford Learner's Dictionaries
3. oldest: Collins English Dictionary
4. Oldest, oldest: Vocabulary.com
5. Oldest, oldest: Wordnik
6. oldest: Cambridge Advanced Learner's Dictionary
7. oldest: Wiktionary
8. oldest: Infoplease Dictionary
9. Oldest, oldest: Dictionary.com
10. oldest: Cambridge Essential American English Dictionary
11. Oldest: Wikipedia, the Free Encyclopedia
12. oldest: Rhymezone
13. oldest: FreeDictionary.org
14. oldest: TheFreeDictionary.com
15. oldest: Wikimedia Commons US English Pronunciations

Business (1 matching dictionary)

16. oldest: Legal dictionary

Computing (1 matching dictionary)

17. oldest: Encyclopedia

Miscellaneous (1 matching dictionary)

18. oldest: Idioms

Slang (1 matching dictionary)

19. oldest: Urban Dictionary

(Note: See old as well.)

Definitions from Wiktionary (oldest) ▸ noun:  The oldest child in a family, or individual in a group. Similar: first, youngest, largest, newest, eldest, earliest, biggest, Longest, smallest, strong, more... Opposite: youngest, newest, freshest, latest, earliest Types: rocks, fossils, artifacts, more... Phrases: oldest profession, oldest religion, oldest civilization, The Oldest Profession, oldest trick in the book, more... Colors:     sepia,     ochre,     umber,     sienna,     rust, more... ▸ Words similar to oldest ▸ Usage examples for oldest ▸ Idioms related to oldest ▸ Wikipedia articles (New!) ▸ Popular adjectives describing oldest ▸ Words that often appear near oldest ▸ Rhymes of oldest ▸ Invented words related to oldest