We found 23 dictionaries that define the word compactness:

General (18 matching dictionaries)

1. compactness: Merriam-Webster
2. compactness: Oxford Learner's Dictionaries
3. compactness: Collins English Dictionary
4. compactness: Vocabulary.com
5. Compactness, compactness: Wordnik
6. compactness: Cambridge Advanced Learner's Dictionary
7. compactness: Wiktionary
8. Compactness, compactness: Dictionary.com
9. Compactness (disambiguation), Compactness (topology), Compactness: Wikipedia, the Free Encyclopedia
10. Compactness: Online Plain Text English Dictionary
11. compactness: Webster's Revised Unabridged, 1913 Edition
12. compactness: Rhymezone
13. Compactness: AllWords.com Multi-Lingual Dictionary
14. compactness: Webster's 1828 Dictionary
15. compactness: FreeDictionary.org
16. compactness: Mnemonic Dictionary
17. compactness: TheFreeDictionary.com

Business (1 matching dictionary)

18. compactness: Legal dictionary

Computing (1 matching dictionary)

19. Compactness (topology), compactness: Encyclopedia

Medicine (1 matching dictionary)

20. compactness: Medical dictionary

Science (1 matching dictionary)

21. compactness, compactness: PlanetMath Encyclopedia

Tech (1 matching dictionary)

22. Glossary of Meteorology (No longer online)

(Note: See compact as well.)

Definitions from Wiktionary (compactness) ▸ noun:  The state of being compact. Similar: concentration, denseness, density, compactedness, cocompactness, paracompactness, precompactness, incompactness, realcompactness, compressiveness, more... Phrases: Compactness theorem, sequential compactness, compactness preserving, Compactness measure of a shape, more... Adjectives: greater, relative, extreme, geographical, more, very, maximum, certain, physical, high, geographic ▸ Words similar to compactness ▸ Usage examples for compactness ▸ Idioms related to compactness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing compactness ▸ Words that often appear near compactness ▸ Rhymes of compactness ▸ Invented words related to compactness