| idiocy | (noun) extreme mental retardation | Synonyms: amentia |
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| idiolatry | (noun) the worship of yourself | Synonyms: autolatry, self-worship |
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| idiolect | (noun) the language or speech of one individual at a particular period in life | - |
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| idiom | (noun) the style of a particular artist or school or movement | Synonyms: artistic style |
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| (noun) the usage or vocabulary that is characteristic of a specific group of people | Synonyms: accent, dialect |
| (noun) an expression whose meanings cannot be inferred from the meanings of the words that make it up | Synonyms: idiomatic expression, phrasal idiom, phrase, set phrase |
| (noun) a manner of speaking that is natural to native speakers of a language | Synonyms: parlance |
| idiopathy | (noun) any disease arising from internal dysfunctions of unknown cause | Synonyms: idiopathic disease, idiopathic disorder |
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| idiosyncrasy | (noun) a behavioral attribute that is distinctive and peculiar to an individual | Synonyms: foible, mannerism |
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| idiot | (noun) a person of subnormal intelligence | Synonyms: changeling, cretin, half-wit, imbecile, moron, retard |
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