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We found 50 dictionaries with English definitions that include the word old:
Click on the first link on a line below to go directly to a page where "old" is defined.

General (34 matching dictionaries)

1. old: Merriam-Webster.com [home, info]
2. old, old: Oxford Learner's Dictionaries [home, info]
3. old: American Heritage Dictionary of the English Language [home, info]
4. old: Collins English Dictionary [home, info]
5. Old, old: Vocabulary.com [home, info]
6. old: Macmillan Dictionary [home, info]
7. O'l'd, Old, o'l'd, old: Wordnik [home, info]
8. old, the old: Cambridge Advanced Learner's Dictionary [home, info]
9. 'old, old: Wiktionary [home, info]
10. old: Webster's New World College Dictionary, 4th Ed. [home, info]
11. old: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. old: Infoplease Dictionary [home, info]
13. Old, -old, old, the old: Dictionary.com [home, info]
14. old: Online Etymology Dictionary [home, info]
15. Old, old: UltraLingua English Dictionary [home, info]
16. old: Cambridge Dictionary of American English [home, info]
17. old: Cambridge International Dictionary of Idioms [home, info]
18. OLD (band), OLD, Old (Danny Brown album), Old (song), Old: Wikipedia, the Free Encyclopedia [home, info]
19. Old: Online Plain Text English Dictionary [home, info]
20. old: Webster's Revised Unabridged, 1913 Edition [home, info]
21. old: Rhymezone [home, info]
22. old: AllWords.com Multi-Lingual Dictionary [home, info]
23. old: Webster's 1828 Dictionary [home, info]
24. OLD: Dictionary of Americanisms (1848) [home, info]
25. OLD: Stammtisch Beau Fleuve Acronyms [home, info]
26. old: Free Dictionary [home, info]
27. old: Mnemonic Dictionary [home, info]
28. old: WordNet 1.7 Vocabulary Helper [home, info]
29. Old, old: LookWAYup Translating Dictionary/Thesaurus [home, info]
30. old: Dictionary/thesaurus [home, info]
31. old: Wikimedia Commons US English Pronunciations [home, info]
32. -old: Dictionary/thesaurus [home, info]

Art (2 matching dictionaries)

33. old: Epicurus.com Coffee Glossary [home, info]
34. OLD: Shakespeare Glossary [home, info]

Business (1 matching dictionary)

35. Old (surname), -old, old: Legal dictionary [home, info]

Computing (2 matching dictionaries)

36. .OLD: BABEL: Computer Oriented Abbreviations and Acronyms [home, info]
37. Old (surname), -old, old: Encyclopedia [home, info]

Medicine (1 matching dictionary)

38. old: online medical dictionary [home, info]

Miscellaneous (4 matching dictionaries)

39. OLD: Acronym Finder [home, info]
40. -old, old: Idioms [home, info]
41. OLD: Three Letter Words with definitions [home, info]
42. OLD: AbbreviationZ [home, info]

Science (1 matching dictionary)

43. old: Nine Planets Glossary [home, info]

Slang (1 matching dictionary)

44. the old: Urban Dictionary [home, info]

Sports (1 matching dictionary)

45. O.L.D, Old: Bicycle Glossary [home, info]

Tech (3 matching dictionaries)

46. OLD: DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations [home, info]
47. old: Glossary of Coffee Terminology [home, info]
48. OLD: Lake and Water Word Glossary [home, info]

(Note: See olds for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (old) ▸ noun:  past times (especially in the phrase `in days of old') ▸ adjective:  of long duration; not new ("Old tradition") ▸ adjective:  (used especially of persons) having lived for a relatively long time or attained a specific age; especially not young; often used as a combining form to indicate an age as specified as in `a week-old baby' ("An old man's eagle mind--William Butler Yeats") ▸ adjective:  lacking originality or spontaneity; no longer new ▸ adjective:  of an earlier time ("His old classmates") ▸ adjective:  of a very early stage in development ("Old English is also called Anglo Saxon") ▸ adjective:  old in experience ("An old offender") ▸ adjective:  just preceding something else in time or order ("My old house was larger") ▸ name:  A surname (common: 1 in 100000 families; popularity rank in the U.S.: #12553) ▸ Also see olds ▸ Word origin ▸ Words similar to old ▸ Usage examples for old ▸ Idioms related to old (New!) ▸ Popular adjectives describing old ▸ Popular nouns described by old ▸ Words that often appear near old ▸ Rhymes of old ▸ Invented words related to old