
Chronic fatigue syndrome (CFS) is the common name for a group of significantly debilitating medical conditions characterized by persistent fatigue and other specific symptoms that lasts for a minimum of six months in adults (and 3 months in children or adolescents). The fatigue is not due to exertion, not significantly relieved by rest, and is not...
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http://en.wikipedia.org/wiki/Chronic_fatigue_syndrome

disorder characterized by at least six months of debilitating fatigue that begins suddenly and may present as a nonspecific illness with mild fever, ... [1 related articles]
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http://www.britannica.com/eb/a-z/c/81

A condition that lasts for more than 6 months in which a person feels tired most of the time. They may also have trouble concentrating and carrying out daily activities. Other symptoms include sore throat, fever, muscle weakness, headache, and joint pain. Also called CFS.
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http://www.cancer.gov/dictionary?expand=C

<syndrome> An unusual illness, of uncertain cause, that is characterised by unexplained fatigue, weakness, muscle pain, lymph node swelling and malaise. ... (27 Sep 1997) ...
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persistent debilitating fatigue of recent onset, with reduction of physical activity to less than half of usual, accompanied by some combination of muscle weakness, sore throat, mild fever, tender lymph nodes, headaches, and depression, with the symptoms not attributable to any other known causes. Its nature is controvers...
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(CFS) Type: Term Definitions: 1. a syndrome of persistent incapacitating weakness or fatigue, accompanied by nonspecific somatic symptoms, lasting at least 6 months, and not attributable to any known cause.
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http://www.medilexicon.com/medicaldictionary.php?t=87829

Our Chronic fatigue syndrome Main Article provides a comprehensive look at the who, what, when and how of Chronic fatigue syndrome Chronic fatigue syndrome: A debilitating and complex disorder characterized by profound fatigue of six months or longer duration that is not improved by bed rest and that may be worsened by physical or mental activity. ...
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http://www.medterms.com/script/main/art.asp?articlekey=2730

A complex disorder that is characterized by persistent exhaustion, muscle weakness, depression, and sleep disturbances. The disorder makes daily tasks very hard to complete. The disorder may get better or worse during pregnancy, depending onm the individual that is affected. It is important to get plenty of rest, eat a well balanced diet and ask......
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an illness characterised by long periods of fatigue, often accompanied by headaches, muscle pain and weakness, and elevated antibody titers to some herpes viruses. The cause or causes are unknown.
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https://cma.asn.au/about-cma/glossary/
(CFS) A debilitating and complex disorder characterized by profound fatigue of six months or longer duration that is not improved by bed rest and that may be worsened by physical or mental activity. Persons with CFS most often function at a substantially lower level of activity than they were capable of before the onset of illness. In additi...
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https://vaccine-safety-training.org/glossary.html

Common debilitating condition characterized by a diffuse range of symptoms present for at least six months including extreme fatigue, muscular pain, weakness, depression, poor balance and coordination, joint pains, and gastric upset. It is usually diagnosed after exclusion of other diseases and frequently follows a flulike illness. The cause of CFS...
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a viral disease of the immune system, usu. characterized by debilitating fatigue and flu-like symptoms.
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https://www.infoplease.com/dictionary/chronic-fatigue-syndrome
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