What is the best description of the word "empathy"?

Empathy is the ability to share what others are feeling or understanding how another person feels. Empathy is an important trait of nurses.The nurse felt empathy for the sick patient and did her best to console him.
The processes and effects of a disease is the definition of pathology.
The pathology of cancer is to attack healthy cells.
To give consent is the definition of assent.
The patient assented to the procedure.
The origin or cause of a disease is etiology.
Exposure to airborne bacteria is the etiology of the boy’s cold.