This is the 17843rd most frequent Russian word.
усваивать
To assimilate or to absorb.
Here, 'усваивать' is used in the context of understanding and internalizing new academic material.
Я быстро усваиваю новые лекции по физике.
I quickly absorb new lectures on physics.
In this sentence, 'усваивать' is used metaphorically to describe the process of adapting to or integrating into a different culture.
Она усваивает культурные традиции своей новой страны.
She assimilates the cultural traditions of her new country.
Here, 'усваивать' refers to learning and accepting important life values and principles.