1To correctly grasp and make sense of the content or meaning of something; understanding, comprehension.
説明が丁寧だったので、内容をすぐに理解できた。
Since the explanation was thorough, I was able to understand the content right away.
この文法は難しくて、なかなか理解できない。
This grammar point is difficult, and I can't quite grasp it.
子どもにも理解できるように、やさしい言葉で説明した。
I explained it in simple words so that even children could understand.
データを見ただけでは、問題の本質を理解するのは難しい。
Just looking at the data makes it difficult to understand the essence of the problem.
2To be considerate of and accept another person's situation or feelings; sympathy — often used politely as in 'please understand' (ご理解ください).
ご不便をおかけしますが、何卒ご理解のほどよろしくお願いいたします。
We apologize for the inconvenience and kindly ask for your understanding.
彼女は私の事情を理解して、快く手伝ってくれた。
She understood my situation and kindly agreed to help.
上司は部下の悩みに理解を示し、相談に乗ってくれた。
My boss showed understanding of his subordinate's worries and offered advice.