Usually means: Measure of language model uncertainty.
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We found 29 dictionaries that define the word Perplexity:

General (24 matching dictionaries)
  1. perplexity: Longman Dictionary of Contemporary English
  2. perplexity: Merriam-Webster
  3. perplexity: Oxford Learner's Dictionaries
  4. perplexity: American Heritage Dictionary of the English Language
  5. perplexity: Collins English Dictionary
  6. perplexity: Vocabulary.com
  7. Perplexity, perplexity: Wordnik
  8. perplexity: Cambridge Advanced Learner's Dictionary
  9. perplexity: Wiktionary
  10. perplexity: Webster's New World College Dictionary, 4th Ed.
  11. perplexity: The Wordsmyth English Dictionary-Thesaurus
  12. perplexity: Infoplease Dictionary
  13. Perplexity, perplexity: Dictionary.com
  14. perplexity: Online Etymology Dictionary
  15. Perplexity (video game), Perplexity: Wikipedia, the Free Encyclopedia
  16. Perplexity: Online Plain Text English Dictionary
  17. perplexity: Webster's Revised Unabridged, 1913 Edition
  18. perplexity: Rhymezone
  19. Perplexity: AllWords.com Multi-Lingual Dictionary
  20. perplexity: FreeDictionary.org
  21. perplexity: Mnemonic Dictionary
  22. perplexity: TheFreeDictionary.com

Business (1 matching dictionary)
  1. perplexity: Legal dictionary

Computing (2 matching dictionaries)
  1. perplexity: Free On-line Dictionary of Computing
  2. perplexity: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Science (1 matching dictionary)
  1. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

(Note: See perplexities as well.)

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Definitions from Wiktionary (perplexity)

▸ noun:  The state or quality of being perplexed.
▸ noun:  Something that perplexes.
▸ noun:  (information theory) A measure of how well a probability distribution or model predicts a sample.

Similar:
perplexment, perplexion, perplexation, perplexedness, perplexingness, perplexiveness, puzzle, puzzlement, puzzledness, bewilderment, more...

Opposite:
clarity, understanding

Types:
confusion, bewilderment, puzzlement, uncertainty, doubt, hesitation, ambivalence, indecision, more...

Adjectives:
great, much, considerable, deepest, extreme, utmost, sore, utter, moral, sad, philosophical

Colors:
    indigo,     mauve,     teal,     chartreuse,     cerulean, more...


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Similar:
perplexment, perplexion, perplexation, perplexedness, perplexingness, perplexiveness, puzzle, puzzlement, puzzledness, bewilderment, more...

Opposite:
clarity, understanding

Types:
confusion, bewilderment, puzzlement, uncertainty, doubt, hesitation, ambivalence, indecision, more...

Adjectives:
great, much, considerable, deepest, extreme, utmost, sore, utter, moral, sad, philosophical

Colors:
    indigo,     mauve,     teal,     chartreuse,     cerulean, more...



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