This is the 218th most frequent Czech word.
postupně
Gradually.
Here, "postupně" emphasizes a gradual progression over time while learning.
Postupně jsme se naučili všechny kroky tance.
Gradually, we learned all the steps of the dance.
Here, "postupně" highlights a progressive realization of importance in sequential steps.
Postupně jsme si uvědomili, jak je to důležité.
Step by step, we realized how important it is.
In this sentence, "postupně" describes the gradual increase in the intensity of the rain.