The word this has a couple of meanings in English. Wiktionary states 5.
I am specifically interested in the translation of the fourth meaning:
A known (thing) (used in first mentioning a person or thing that the speaker does not think is known to the audience). Compare with “a certain …”
I met this woman the other day who’s allergic to wheat. I didn’t even know that was possible!
There’s just this nervous mannerism that Bob has with his hands, and it drives me crazy.
This description led me to certain, which translates to bestimmt. Is it safe to say, that “Ich traf diese bestimmte Frau” means “I met this woman”? I am worried it does not.
I actually need this because I don’t know how to say the following:
In my country there is this tradition …
In meinem Heimatland gibt es diese bestimmte Tradition …
Is this correct?