Definition of "perplexity"

perplexity

/pəˈplɛksɪti/

noun
countable and uncountable, plural perplexities
1. The state or quality of being perplexed.
2. Something that perplexes.
  Quotations
  The Emperor, who was by then a focus of unresolvable perplexities, stood providing a strongly contrary appearance.
  1942, Rebecca West, Black Lamb and Grey Falcon, Canongate, published 2006, page 149
3. (information theory) A measure of how well a probability distribution or model predicts a sample.