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Something puzzling or difficult to understand.
noun
Reveal word and examples
enigma
The unexplained symbols remained an enigma to the researchers.
Dictionary practice example.
In Jo's workshop story, a missed train served as the antecedent to an unexpected meeting in an empty station cafe. The climax arrived when the two travelers recognized that each carried half of the same unfinished letter. Until then, the letter's origin had remained an enigma for the characters and readers.
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