All 3 Uses

dialect
in
Politics and the English Language
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The political dialects to be found in pamphlets, leading articles, manifestoes, White Papers and the speeches of under-secretaries do, of course, vary from party to party, but they are all alike in that one almost never finds in them a fresh, vivid, home-made turn of speech.†

dialects = regional varieties of a language
When you think of something abstract you are more inclined to use words from the start, and unless you make a conscious effort to prevent it, the existing dialect will come rushing in and do the job for you, at the expense of blurring or even changing your meaning.†

dialect = regional variety of a language
You cannot speak any of the necessary dialects, and when you make a stupid remark its stupidity will be obvious, even to yourself.†
*

dialects = regional varieties of a language

Definitions:

(1) (dialect)
a regional variety of a language

A dialect can use a different accent, vocabulary, and grammar than other dialects of the same language.
(2) (meaning too rare to warrant focus)