idiosyncrasy
noun
id·i·o·syn·cra·sy
ˌi-dē-ə-ˈsiŋ-krə-sē
plural idiosyncrasies
1
a
: a peculiarity of constitution or temperament : an individualizing characteristic or quality
b
: individual hypersensitiveness (as to a drug or food)
2
: characteristic peculiarity (as of temperament)
broadly
: eccentricity
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Merriam-Webster unabridged
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