menti-, ment- +

1. A sound mind in a sound body. -Juvenal
2. A healthy mind in a healthy body.

Actually, the whole sentence is Orandum est ut sit mens sana in corpore sano. ("You should pray for a healthy mind in a healthy body.")

Juvenal, in his Satires, suggests to us that we must pray for attainment of mens sana in corpore sano, and his phrase has found use for many centuries as the stated educational goal of many schools: to train the body as well as the mind.

Public statements by some near-illiterate college athletes suggest that the sound body is too often achieved without accompanying improvement of the mind.

1. Pertaining to the mind, psyche, or inner self, as in mental health, mental powers, or mental suffering.
2. A reference to the intellectual or cognitive functions, as distinct from the affective and conative, as in mental test.
3. Imaginary or unreal, as when a pain is said to be merely mental.
4. Pertaining to, or affected by a disorder of the mind: a mental patient; mental illness.
5. Providing care for people with disordered minds, emotions, etc.: a mental hospital.
6. Performed by or existing in the mind: mental arithmetic; a mental note.

1. The doctrine that objects of knowledge have no existence except in the mind of the perceiver.
2. The doctrine that human conduct reflects the operation of a nonmaterial principle.
3. Any psychological theory that accepts as a proper subject of study the mental basis for human behavior.
4. Parapsychological activities; such as, telepathy and mind reading.
5. The belief that some mental phenomena cannot be explained by physical laws.

1. Mental capacity or endowment; such as, a person of average mentality.
2. The set of one's mind; view; outlook; as, a liberal mentality.
3. A habitual or characteristic mental attitude that determines how a person will interpret and respond to situations; outlook, mindset.

1. Of or relating to the mind; specifically: of or relating to the total emotional and intellectual response of an individual to external reality.
2. Of or relating to intellectual as contrasted with emotional activity.
3. Relating to, or being intellectual as contrasted with overt physical activity.
4. Occurring or experienced in the mind.

The process of thinking; especially thinking carefully.

1. A word coined by J. A. M. Meerloo to designate the undermining or destruction of a person’s mind or will by “psychological intervention and judicial perversion”; also in extended use, brainwashing.
2. The systematic effort to undermine and destroy a person's values and beliefs, as by the use of prolonged interrogation, drugs, torture, etc., and to induce radically different ideas.

1. Someone, usually older and more experienced, who advises and guides a younger, less experienced person.
2. A senior or experienced person in a company or organization who gives guidance and training to a junior colleague.
3. To act as a mentor to someone, especially a junior colleague.
4. A wise and trusted guide and adviser who serves as a teacher or trusted counselor.
5. When capitalized, Mentor in Greek mythology, the friend whom Odysseus left in charge of the household while he was at Troy and who was the teacher and protector of Telemachus, Odysseus's son.
6. Etymology: a "wise advisor" from 1750; from Greek Mentor, a character in the "Odyssey", a friend of Odysseus, adviser of Telemachus (often actually Athene in disguise). Perhaps ultimately meaning "adviser", since the name appears to be an agent noun of mentos, "intent, purpose, spirit, passion"; from Latin monitor, "one who admonishes". A causative form of base men-, "to think"; as in mental.

Here is more background information about Mentor which will help you understand this word better.

Dementia of Alzheimer disease developing before age 65.

A severe form of depression resulting from a progressive brain disorder in which cognitive changes mimic those of dementia.

A depressive disorder is a syndrome (group of symptoms) that reflects a sad mood exceeding normal sadness or grief. More specifically, the sadness of depression is characterized by a greater intensity and duration and by more severe symptoms and functional disabilities than is normal.

Depression symptoms are characterized not only by negative thoughts, moods, and behaviors, but also by specific changes in bodily functions; for example, irregular eating, sleeping, crying spells, and decreased libido.

The functional changes of clinical depression are often called "neurovegetative signs". This means that the nervous system changes in the brain cause many physical results that result in diminished activity and participation.

A form of brain disorder marked by progressive and irreversible mental deterioration, memory loss, and disorientation; known to affect some people after the age of about 65 years.

Chronic brain disorder with the loss of intellectual functioning resulting from a severe cerebral injury.

A common form of dementia in older persons that is due to cerebrovascular disease, usually with step-by-step deterioration from a series of small strokes and a patchy distribution of neurologic deficits affecting some functions and not others.

Risk factors include high blood pressure, an unsteady way of walking, and advanced age.

Symptoms include confusion, problems with recent memory, wandering or getting lost in familiar places, loss of bladder or bowel control (incontinence), emotional problems; such as, laughing or crying inappropriately, difficulty following instructions, and problems handling money.