We found 18 dictionaries that define the word massing:

General (14 matching dictionaries)

1. massing: Merriam-Webster
2. massing: Collins English Dictionary
3. massing: Vocabulary.com
4. Massing, massing: Wordnik
5. massing: Cambridge Advanced Learner's Dictionary
6. massing: Wiktionary
7. Massing, massing: Dictionary.com
8. massing: Cambridge Essential American English Dictionary
9. Massing (disambiguation), Massing (surname), Massing: Wikipedia, the Free Encyclopedia
10. Massing: Online Plain Text English Dictionary
11. Massing: Rhymezone
12. Massing: AllWords.com Multi-Lingual Dictionary
13. massing: FreeDictionary.org
14. massing: TheFreeDictionary.com

Business (1 matching dictionary)

15. massing: Legal dictionary

Computing (1 matching dictionary)

16. massing: Encyclopedia

Medicine (1 matching dictionary)

17. massing: Medical dictionary

Slang (1 matching dictionary)

18. massing: Urban Dictionary

(Note: See mass as well.)

Definitions from Wiktionary (massing) ▸ noun:  A bringing together into a mass. Similar: bulk, large-scale, great deal, mickle, plenty, sight, people, lot, general, heap, more... Types: mass, more... Phrases: massing together, more... Adjectives: simple, general, exterior, bold, asymmetrical, overall, main, irregular, picturesque, wet, mere ▸ Words similar to massing ▸ Usage examples for massing ▸ Idioms related to massing ▸ Wikipedia articles (New!) ▸ Popular adjectives describing massing ▸ Words that often appear near massing ▸ Rhymes of massing ▸ Invented words related to massing