Refers to a person's distinctive or unusual trait that makes them stand out. His eccentricity was his habit of wearing a hat to bed.
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Often Positive
Though it might sound negative, 'eccentricity' often suggests uniqueness in a charming way. People admired her eccentricity, like talking to plants as if they were children.
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Not Social Norm
Eccentricity indicates behavior that differs from social norms but isn't necessarily harmful. He celebrated his birthday in eccentricity, with a midnight swim in the lake.