Unipolar may refer to:

Electronics

* Unipolar generator, a DC electrical generator * Unipolar motor, a type of small DC electric motor * Unipolar transistor, transistors that involve single-carrier-type operation

Science and medicine

Unipolar depression Major depressive disorder (MDD), also known as clinical depression, is a mental disorder characterized by at least two weeks of pervasive depression (mood), low mood, low self-esteem, and anhedonia, loss of interest or pleasure in normally ...

or major depressive disorder * Unipolar mania, an uncommon mental disorder that causes manic episodes without any history of depression *

Unipolar neuron A unipolar neuron is a neuron in which only one process, called a neurite, extends from the cell body. The neurite then branches to form dendritic and axonal processes. Most neurons in the central nervous systems of invertebrates, including inse ...

, a neuron with a single neurite

Other uses

* Unipolar encoding, a line code *

Unipolarity Polarity in international relations is any of the various ways in which power is distributed within the international system. It describes the nature of the international system at any given period of time. One generally distinguishes three types ...

, a distribution of power in international relations in which one state exercises most of the cultural, economic, and military influence {{disambig