The difference between Dialect and Idiom
When used as nouns, dialect means a variety of a language that is characteristic of a particular area, community or social group, often differing from other varieties of the same language in minor ways as regards vocabulary, style, pronunciation, and orthographic conventions, whereas idiom means a manner of speaking, a mode of expression peculiar to a language, person, or group of people.
check bellow for the other definitions of Dialect and Idiom
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Dialect as a noun (linguistics):
A variety of a language that is characteristic of a particular area, community or social group, often differing from other varieties of the same language in minor ways as regards vocabulary, style, pronunciation, and orthographic conventions; either standard or nonstandard (vernacular).
Examples:
"hypo sociolect ethnolect regiolect"
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Dialect as a noun (pejorative):
Language that is perceived as substandard or wrong.
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Dialect as a noun:
A lect (often a or language) as part of a group or family of languages, especially if they are viewed as a single language, or if contrasted with a standardized idiom that is considered the 'true' form of the language (for example, Cantonese as contrasted with Mandarin Chinese, or Bavarian as contrasted with Standard German).
Examples:
"synonyms: vernacular patois q2=often derogatory"
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Dialect as a noun (computing, programming):
A variant of a non-standardized programming language.
Examples:
"Home computers in the 1980s had many incompatible dialects of BASIC."
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Dialect as a noun (ornithology):
A variant form of the vocalizations of a bird species restricted to a certain area or population.
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Idiom as a noun:
A manner of speaking, a mode of expression peculiar to a language, person, or group of people.
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Idiom as a noun:
A language or language variety; specifically, a restricted dialect used in a given historical period, context etc.
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Idiom as a noun:
An established expression whose meaning is not deducible from the literal meanings of its component words, often peculiar to a given language.
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Idiom as a noun:
An artistic style (for example, in art, architecture, or music); an instance of such a style.
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Idiom as a noun (programming):
A programming construct or phraseology that is characteristic of the language.