Understanding

noun

2. The ability by which one understands; intelligence.

   "concepts that are beyond the understanding of a child."

3. The quality or condition of one who understands; comprehension: synonym: reason.

   "Do you have much understanding of calculus?"

4. Individual or specified judgment or outlook; opinion.

   "In my understanding, this is a good plan."

5. A usually implicit agreement between two or more people or groups.

   "an understanding between neighbors over late-night noise."