We found 28 dictionaries that define the word marks:

General (13 matching dictionaries)

1. Marks, marks: Merriam-Webster
2. marks: Collins English Dictionary
3. Marks, marks: Vocabulary.com
4. Mark's, Marks, Marks, mark's, marks: Wordnik
5. marks: Cambridge Advanced Learner's Dictionary
6. Marks, marks: Wiktionary
7. marks: Dictionary.com
8. marks: Cambridge Essential American English Dictionary
9. Mark's, Marks (disambiguation), Marks (manor house), Marks (surname), Marks: Wikipedia, the Free Encyclopedia
10. Marks: Rhymezone
11. marks: FreeDictionary.org
12. marks: Mnemonic Dictionary
13. Marks: TheFreeDictionary.com

Business (4 matching dictionaries)

14. marks: Merriam-Webster Legal Dictionary
15. eyefortransport e-commerce transportation glossary (No longer online)
16. Marks: Legal dictionary
17. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)

18. Marks: Encyclopedia

Medicine (2 matching dictionaries)

19. marks: Merriam-Webster Medical Dictionary
20. Marks: Medical dictionary

Miscellaneous (3 matching dictionaries)

21. MARKS: Acronym Finder
22. AbbreviationZ (No longer online)
23. Marks: Idioms

Religion (1 matching dictionary)

24. Buddhism Glossary (No longer online)

Slang (2 matching dictionaries)

25. marks, Marks: Green’s Dictionary of Slang
26. marks: Urban Dictionary

Sports (1 matching dictionary)

27. Marks: Sports Definitions

Tech (1 matching dictionary)

28. marks: Coin Collecting

(Note: See mark as well.)

Definitions from Wiktionary (Marks) ▸ noun:  A surname transferred from the given name derived from the given name Mark. ▸ noun:  A city, the county seat of Quitman County, Mississippi, United States. Similar: mark off, sign, note, label, notice, punctuate, set, grade, commemorate, differentiate, more... Opposite: erasures, blanks, unmarks, deletions, cleanings Types: underline, italics, bold, superscript, subscript, strikeout, more... Phrases: quotation marks, trade marks, punctuation marks, question marks, service marks, more... Adjectives: high, black, distinguishing, trade, diacritical, red, certain, evident, distinctive, german, ripple Colors:     red,     blue,     green,     yellow,     black, more... ▸ Words similar to marks ▸ Usage examples for marks ▸ Idioms related to marks ▸ Wikipedia articles (New!) ▸ Popular adjectives describing marks ▸ Words that often appear near marks ▸ Rhymes of marks ▸ Invented words related to marks