1
: having or marked by two mutually repellent forces or diametrically opposed natures or views
2
a
: having or involving the use of two poles or polarities
bipolar generators
bipolar ECG leads
b
electronics : relating to, being, or using a transistor in which both electrons and holes (see hole entry 1 sense 1b(3)) are utilized as charge carriers (see carrier sense 2e)
3
: relating to, associated with, or occurring in both polar (see polar entry 1 sense 1a) regions
bipolar species of birds
4
psychology : being, characteristic of, or affected with a bipolar disorder
bipolar patients
variants also British bipolarise
(ˌ)bī-ˈpō-lə-ˌrīz
: to bring into a bipolar state
bipolarization noun
The students Manhattan College is pursuing are the products of New York's shift toward a service-based economy, Brother [Thomas J.] Scanlan said. "The economy has led to a bipolarization of society and students have become either very wealthy or very poor," he said. New York Times, 23 Mar. 1988

Examples of bipolar in a Sentence

Recent Examples on the Web
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Adjective
People with bipolar 2 disorder experience cycles of depression and hypomania, which is less intense than the mania experienced with bipolar 1 disorder. Michael Casey, Fortune, 25 Aug. 2026 Kirk Heilbrun, a forensic psychologist who diagnosed Clancy with bipolar II disorder, is back on the stand. Nbc News, NBC news, 25 Aug. 2026 Suez became a shorthand for the demise of the European empires and the passage from a multipolar world to the bipolar Cold War–era system. Marc Lynch, Foreign Affairs, 18 Aug. 2026 Her attorneys say her condition seemed to worsen on the psychiatric medications, some of them problematic for bipolar patients. Michael Casey, Chicago Tribune, 5 Aug. 2026 See All Example Sentences for bipolar

Word History

First Known Use

Adjective

1806, in the meaning defined at sense 2a

Time Traveler
The first known use of bipolar was in 1806

Browse Nearby Words

Cite this Entry

“Bipolar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bipolar. Accessed 1 Sep. 2026.

Kids Definition

bipolar

adjective
1
: having or involving two poles
2
: having or marked by two mutually repellent forces or wholly opposed natures or views
3
: being, characteristic of, or affected with a bipolar disorder
bipolarity
ˌbī-​pō-​ˈler-​ə-​tē
noun

Medical Definition

bipolar

1 of 2 adjective
bi·​po·​lar
(ˈ)bī-ˈpō-lər
1
: involving or being electrodes or leads attached to two different bodily sites (such as the arms and legs) for recording the difference in electrical potential between the two sites
bipolar encephalograph leads
2
of a neuron : having an efferent and an afferent process
3
: being, characteristic of, or affected with a bipolar disorder
bipolar depression
bipolar patients
compare unipolar

bipolar

2 of 2 noun
: a person affected with bipolar disorder
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