Noun enigma has 2 senses
  1. mystery, enigma, secret, closed book - something that baffles understanding and cannot be explained; "how it got out is a mystery"; "it remains one of nature's secrets"
    --1 is a kind of perplexity
  2. riddle, conundrum, enigma, brain-teaser - a difficult problem
    --2 is a kind of problem
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