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We found 11 dictionaries with English definitions that include the word portentousness:
Click on the first link on a line below to go directly to a page where "portentousness" is defined.

General (10 matching dictionaries)

1. portentousness: Merriam-Webster.com [home, info]
2. portentousness: Oxford Learner's Dictionaries [home, info]
3. portentousness: Collins English Dictionary [home, info]
4. portentousness: Wordnik [home, info]
5. portentousness: Wiktionary [home, info]
6. portentousness: Dictionary.com [home, info]
7. portentousness: Free Dictionary [home, info]
8. portentousness: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

9. portentousness: Legal dictionary [home, info]

(Note: See portentously for more definitions.)

Quick definitions from WordNet (portentously) ▸ adverb:  in a portentous manner ("Portentously, the engines began to roll") ▸ Also see portentously ▸ Words similar to portentousness ▸ Usage examples for portentousness ▸ Idioms related to portentousness (New!) ▸ Words that often appear near portentousness ▸ Rhymes of portentousness ▸ Invented words related to portentousness