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We found 52 dictionaries with English definitions that include the word sum:
Click on the first link on a line below to go directly to a page where "sum" is defined.

General (33 matching dictionaries)

1. sum: Merriam-Webster.com [home, info]
2. sum: Oxford Dictionaries [home, info]
3. sum, sum: American Heritage Dictionary of the English Language [home, info]
4. sum: Collins English Dictionary [home, info]
5. sum: Vocabulary.com [home, info]
6. sum, sum: Macmillan Dictionary [home, info]
7. Sum, sum: Wordnik [home, info]
8. sum: Cambridge Advanced Learner's Dictionary [home, info]
9. Sum, sum: Wiktionary [home, info]
10. sum, sum-: Webster's New World College Dictionary, 4th Ed. [home, info]
11. sum, sum-: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. sum: Infoplease Dictionary [home, info]
13. SUM, sum-: Dictionary.com [home, info]
14. sum: Online Etymology Dictionary [home, info]
15. sum: UltraLingua English Dictionary [home, info]
16. sum: Cambridge Dictionary of American English [home, info]
17. sum: Cambridge International Dictionary of Idioms [home, info]
18. S.U.M, SUM (interbank network), SUM, Sum (Mongolia), Sum (Unix), Sum (category theory), Sum (country subdivision), Sum (subnational entity), Sum: Wikipedia, the Free Encyclopedia [home, info]
19. sum: Cambridge International Dictionary of Phrasal Verbs [home, info]
20. Sum: Online Plain Text English Dictionary [home, info]
21. sum: Webster's Revised Unabridged, 1913 Edition [home, info]
22. sum: Rhymezone [home, info]
23. sum: AllWords.com Multi-Lingual Dictionary [home, info]
24. sum: Webster's 1828 Dictionary [home, info]
25. sum: All About Homonyms [home, info]
26. sum: Free Dictionary [home, info]
27. sum: Mnemonic Dictionary [home, info]
28. sum: WordNet 1.7 Vocabulary Helper [home, info]
29. Sum, sum: LookWAYup Translating Dictionary/Thesaurus [home, info]
30. sum: Dictionary/thesaurus [home, info]
31. sum: Wikimedia Commons US English Pronunciations [home, info]

Art (2 matching dictionaries)

32. -sum: A Cross Reference of Latin and Greek Elements [home, info]
33. Sum: Glossary of Stamp Collecting Terms [home, info]

Business (2 matching dictionaries)

34. sum: Legal dictionary [home, info]
35. sum: BusinessDictionary.com [home, info]

Computing (2 matching dictionaries)

36. sum: Free On-line Dictionary of Computing [home, info]
37. sum: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

38. sum: online medical dictionary [home, info]
39. sum: Medical dictionary [home, info]

Miscellaneous (5 matching dictionaries)

40. sum: Sound-Alike Words [home, info]
41. SUM: Acronym Finder [home, info]
42. SUM: Three Letter Words with definitions [home, info]
43. SUM: AbbreviationZ [home, info]
44. sum: Idioms [home, info]

Science (4 matching dictionaries)

45. Sum: Eric Weisstein's World of Mathematics [home, info]
46. sum: MATH SPOKEN HERE! [home, info]
47. sum, sum: PlanetMath Encyclopedia [home, info]
48. sum: FOLDOP - Free On Line Dictionary Of Philosophy [home, info]

Slang (1 matching dictionary)

49. s'um, sum: Urban Dictionary [home, info]

Tech (1 matching dictionary)

50. SUM: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING [home, info]

(Note: See sums for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (sum) ▸ noun:  the whole amount ▸ noun:  a quantity obtained by addition ▸ noun:  the final aggregate ("The sum of all our troubles did not equal the misery they suffered") ▸ noun:  a quantity of money ("He borrowed a large sum") ▸ noun:  the basic unit of money in Uzbekistan ▸ noun:  the choicest or most essential or most vital part of some idea or experience ▸ noun:  a set containing all and only the members of two or more given sets ▸ verb:  be a summary of ("The abstract summarizes the main ideas in the paper") ▸ verb:  determine the sum of ▸ name:  A surname (very rare: popularity rank in the U.S.: #19407) ▸ Also see sums ▸ Word origin ▸ Words similar to sum ▸ Usage examples for sum ▸ Popular adjectives describing sum ▸ Words that often appear near sum ▸ Rhymes of sum ▸ Invented words related to sum