definition for the term mentally
Medical Definition of mental. 1  1a: of or relating to the mind; specifically : of or relating to the total emotional and intellectual response of an individual to external realityb: of or relating to intellectual as contrasted with emotional activity.
Mental Health Conditions. A mental illness is a condition that affects a person's thinking, feeling or mood. Such conditions may affect someone's ability to relate to others and function each day. Each person will have different experiences, even people with the same diagnosis.