This is the 477th most frequent German word.
teilweise
Partially; partly; in part.
Here, 'teilweise' is used to indicate partial presence or extent, describing that only part of the garden is in the shade.
Der Garten ist teilweise im Schatten.
The garden is partially in the shade.
In this sentence, 'teilweise' conveys an incomplete understanding of the situation or action.
Teilweise verstehe ich, warum du das getan hast.
I partially understand why you did that.
Here, 'teilweise' refers to the extent to which something (the concept) has been carried out, emphasizing incomplete realization or execution.