un·der·stand·ing 
(ŭn′dər-stăndĭng)
(ŭn′dər-stăndĭng)n.
1.
a. The ability by which one understands; intelligence: concepts that are beyond the understanding of a child.
b. The quality or condition of one who understands; comprehension: Do you have much understanding of calculus? See Synonyms at reason.
2. Individual or specified judgment or outlook; opinion: In my understanding, this is a good plan.
3. A usually implicit agreement between two or more people or groups: an understanding between neighbors over late-night noise.
4. A disposition to appreciate or share the feelings and thoughts of others; sympathy: Can't you show some understanding for the poor child?
adj.
Characterized by or having good sense or compassion: an understanding teacher.
un′der·standing·ly adv.