This is the 5462nd most frequent Polish word.
tajne
"Secret" or "confidential."
In this sentence, the word 'tajne' means 'confidential' or 'classified', referring to documents that require special security due to sensitive information.
Strzeżemy nasze tajne dokumenty.
We guard our confidential documents.
Here, 'tajne' describes a meeting that was secret or conducted without public knowledge.
Spotkanie było tajne, nikogo nie informowano.
The meeting was confidential, no one was informed.
In this usage, 'tajne' qualifies the agreements as being signed under confidentiality or secrecy.