This is the 8338th most frequent Turkish word.
nadja
The word "nadja" is not a Turkish word. It might be a name or belong to another language.
In this sentence, 'Nadja' is a proper noun, specifically a name of a person.
Nadja bugün bize katılacak.
Nadja will join us today.
Here, 'nadja' is mentioned as a lexical word, referring to its meaning in some ancient languages.
Bazı eski dillerde 'nadja' kelimesi umut anlamını taşır.
In some ancient languages, the word 'nadja' carries the meaning of hope.
In this case, 'Nadja' again is a proper noun, used within a possessive context in Turkish ('Nadja'nın').