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We found 18 dictionaries with English definitions that include the word portentously:
Click on the first link on a line below to go directly to a page where "portentously" is defined.

General (17 matching dictionaries)

1. portentously: Merriam-Webster.com [home, info]
2. portentously: Oxford Dictionaries [home, info]
3. portentously: Collins English Dictionary [home, info]
4. portentously: Vocabulary.com [home, info]
5. portentously: Wordnik [home, info]
6. portentously: Cambridge Advanced Learner's Dictionary [home, info]
7. portentously: Wiktionary [home, info]
8. portentously: Dictionary.com [home, info]
9. portentously: UltraLingua English Dictionary [home, info]
10. portentously: Rhymezone [home, info]
11. portentously: Free Dictionary [home, info]
12. portentously: Mnemonic Dictionary [home, info]
13. portentously: WordNet 1.7 Vocabulary Helper [home, info]
14. portentously: LookWAYup Translating Dictionary/Thesaurus [home, info]
15. portentously: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

16. portentously: Legal dictionary [home, info]

(Note: See portentousness for more definitions.)

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