Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: aenigma, from Greek, from ainos 'story'

enigma

 noun
     
e‧nig‧ma [countable]
someone or something that is strange and difficult to understand [= mystery]:
The neighbours regarded him as something of an enigma.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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