enigma

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Definitions from WordNet

Noun enigma has 2 senses

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
riddle, conundrum, enigma, brain-teaser - a difficult problem
--₂ is a kind of problem

Definitions from the Web

Enigma

Noun:

1. A person, thing, or situation that is mysterious, puzzling, or difficult to understand.

Example sentence: The disappearance of the ancient civilization remains an enigma to archaeologists.

2. An encoded message or cipher that requires a key or code to decipher its meaning.

Example sentence: The spy used a complex enigma to communicate with his handler.

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