platnost in English:

We'll verify the validity of our presumptions.

His attorney questioned the validity of the agreement.

You are certain as to the validity of the new data?

This research seems to give/lend some validity to the theory that the drug might cause cancer.

account validity

The period of validity of the single-entry visa is three months.

We'll verify the validity of our presumptions. This raises the questions over the validity of such claims.

the state of being acceptable or reasonable: We'll verify the validity of our presumptions.

Any doubts about the validity of this argument are promptly forgotten once we see the data.

I should point out that it is necessary to re-examine the validity of Emmet's theory.

In the opening paragraphs I query the validity of so-called supply-side economic strategies.

If your licence exceeds its validity period then you can be issued with a new licence in the following way.