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We found 23 dictionaries with English definitions that include the word oldest:
Click on the first link on a line below to go directly to a page where "oldest" is defined.

General (19 matching dictionaries)

1. oldest: Merriam-Webster.com [home, info]
2. oldest: Oxford Dictionaries [home, info]
3. oldest: Collins English Dictionary [home, info]
4. Oldest, oldest: Vocabulary.com [home, info]
5. Oldest, oldest: Wordnik [home, info]
6. oldest: Cambridge Advanced Learner's Dictionary [home, info]
7. oldest: Wiktionary [home, info]
8. oldest: Infoplease Dictionary [home, info]
9. Oldest, oldest: Dictionary.com [home, info]
10. oldest: UltraLingua English Dictionary [home, info]
11. oldest: Cambridge Dictionary of American English [home, info]
12. oldest: Cambridge International Dictionary of Idioms [home, info]
13. Oldest: Wikipedia, the Free Encyclopedia [home, info]
14. oldest: Rhymezone [home, info]
15. oldest: Free Dictionary [home, info]
16. oldest: WordNet 1.7 Vocabulary Helper [home, info]
17. oldest: LookWAYup Translating Dictionary/Thesaurus [home, info]
18. oldest: Dictionary/thesaurus [home, info]
19. oldest: Wikimedia Commons US English Pronunciations [home, info]

Business (1 matching dictionary)

20. oldest: Legal dictionary [home, info]

Computing (1 matching dictionary)

21. oldest: Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

22. oldest: Idioms [home, info]

Slang (1 matching dictionary)

23. oldest: Urban Dictionary [home, info]

(Note: See olds for more definitions.)

Quick definitions from WordNet (oldest) ▸ adjective:  first in time ("The oldest rocks on the planet") ▸ Also see olds ▸ Words similar to oldest ▸ Usage examples for oldest ▸ Popular nouns described by oldest ▸ Words that often appear near oldest ▸ Rhymes of oldest ▸ Invented words related to oldest