cyclothymia

n.
A mild affective disorder characterized by alternating periods of elevated and depressed mood.

cyclothymic cy'clo·thy'mic (-mĭk) adj. & n.

(sī'klə-thī'mē-ə)
n.

A mild affective disorder characterized by alternating periods of elation and depression.

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The noun has one meaning:

Meaning #1: a mild bipolar disorder that persists over a long time
  Synonyms: cyclothymic disorder, cyclic disorder

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