in a sense; in some way; to an extent
Used to qualify a statement, acknowledging that it is true from a certain perspective or to a limited degree. Often softens assertions.
ある意味では、彼の言うことも正しい。
In a sense, what he says is also correct.
この仕事は、ある意味では簡単だ。
This job is, in some way, easy.
ある意味では and ある意味で are interchangeable, but では is more common in speech while で can feel a touch more formal or written.
Phrase composed of ある (a certain), 意味 (meaning/sense), and the particle では (indicating scope or condition).