in DSM–IV–TR and DSM–5, a mood disorder characterized by persistent sadness and other symptoms of a major depressive episode but without accompanying episodes of mania or hypomania or mixed episodes of depressive and manic or hypomanic symptoms. Also called major depression.

in DSM–IV–TR and DSM–5, a mood disorder characterized by persistent sadness and other symptoms of a major depressive episode but without accompanying episodes of mania or hypomania or mixed episodes of depressive and manic or hypomanic symptoms. 

a period characterized by elevated, expansive, or irritable mood, often with several of the following symptoms: an increase in activity or psychomotor agitation; talkativeness or pressured speech; flight of ideas or racing thoughts; inflated self-esteem or grandiosity; a decreased need for sleep; extreme distractibility; and intense pursuit of activities that are likely to have unfortunate consequences (e.g., buying sprees, sexual indiscretions).

any abnormality in motor processes, relating primarily to posture, coordination, or locomotion. See also medication-induced movement disorder.

Muscle weakness or myasthenia (my- from Greek μυο meaning "muscle" + -asthenia ἀσθένεια meaning "weakness") is a lack of muscle strength. The causes are many and can be divided into conditions that have either true or perceived muscle weakness. 

n. any disease or disorder of the muscles, hereditary or acquired. The term is usually qualified by an adjective that specifies the type of myopathy or its cause.