Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Greek
Origin: idiosynkrasia, from idio- ( IDIOLECT) + synkerannynai 'to mix together'

idiosyncrasy

 noun
     
id‧i‧o‧syn‧cra‧sy plural idiosyncrasies [countable]
1 an unusual habit or way of behaving that someone has:
my uncle's idiosyncrasies
2 an unusual or unexpected feature that something has:
one of the many idiosyncrasies of English spelling
—idiosyncratic adjective
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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