New answers tagged dialects
The only widely accepted spelling is "meines Wissens" It is as early as the 16th Century when the term "meines Wissens" was used in written German documents. The earliest Google reference dates back to 1539: Another spelling was never used, at least not within the limits we can search by Google (search hits for "meinet wissens" were exclusively from ...
As @sollniss already mentioned, this is just a regional pronunciation of the word written literally. The tone of the text is rather informal and the author probably didn't worry too much about using standard spelling (you can tell just by looking at nem instead of einem). However, this is not exclusive of Berlinerisch. This map shows other regions that ...
Meinet is the berlinerisch version of meines.
You are mixing up two linguistic categories: Dialects and varieties. Neither British English nor American English nor Australian English are English dialects. They are varieties of English. And of course, beside those varieties there are lots of english dialects. The same is true for German. There are three standard varieties of German language: German ...
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