This is the 10490th most frequent Polish word.
dana
"Data" or "given (information)."
The word 'dana' here is used as an adjective meaning 'given' or 'specific' to describe a particular person.
Dana osoba powinna zgłosić się do sekretariatu.
The given person should report to the secretary's office.
The word 'dane' here represents plural noun meaning 'data', specifically personal information.
Dane osobowe są chronione zgodnie z prawem.
Personal data are protected according to the law.
The word 'dane' here again refers to data or information, functioning as a plural noun in a technological context.