Definition of bipolar in US English:



  • 1Having or relating to two poles or extremities.

    ‘a sharply bipolar division of affluent and underclass’
    • ‘The bipolar division of the environment into pure wilderness and impure everything else has deeply compromised environmentalism and sometimes skews environmental history.’
    • ‘At its heart lie the contention that ‘Bedouin society never changes’ and the bipolar division of history into pre-modern and modern communities.’
    • ‘Weighing these two diametrically opposed reactions, juveniles may be unable to accurately select between two extreme bipolar adjectives to describe themselves through their parents' eyes.’
    • ‘The absurd oversimplification of a bipolar political model was encouraged by the propaganda excesses of the cold wars but has never really been of much use for understanding the political scene.’
    • ‘Indeed, when communism constituted one of the two poles in the previous bipolar world order, terrorist acts were few and far between.’
    • ‘If they are able in the next municipal and parliamentary elections to hold such a position, this will allow them to block the return of the bipolar structure of the Bulgarian political sphere.’
    • ‘In 1991, the bipolar world of U.S.-Soviet domination collapsed.’
    • ‘Certainly most humans hold complicated and deep-seated views on deceit and candor; Americans, however, seem to have an especially bipolar one.’
    • ‘The original moon landing race was a bipolar affair, with America and Russia urgently scrabbling to make space a ‘sphere of influence’.’
    • ‘At the heart of this burden lies a sort of bipolar personal narrative; the story has a neat division, a before and an after, where the homeland represents an asymptote of fulfillment, a sustaining force in the story.’
    • ‘The breakdown of the Soviet Union, which formed one of the two poles in the former bipolar world order brought to an end the set of rules that had governed international relations since the end of World War II.’
    • ‘Whether it will indeed be called that will become clear on March 10, when Simeon II is expected to announce the coalition that has the potential to shatter the current bipolar model.’
    • ‘Under the previous bipolar world order, NATO stood as a counter-pole to the military arm of the Eastern bloc, the Warsaw Pact.’
    • ‘Audiences seemed to emerge with bipolar responses to the movie: either they loved it or were simply baffled, left scratching their heads in anguish over the film's countless conundrums.’
    • ‘The previous bipolar world order, based on mutual deterrence between the two superpowers, engendered a sort of mutual neutralisation.’
    • ‘Extroversion is one pole of the bipolar extroversion-introversion dimension.’
    • ‘His declaration is directly related to a change in the bipolar model.’
    • ‘Or perhaps into several camps, but when one is worth more than all the others combined, a more or less bipolar world may be inevitable.’
    • ‘Mick O'Regan: Population increase in certain areas has become characterised by what geographers call bipolar growth.’
    • ‘This bipolar desire for overwhelming power everywhere while sticking our necks out nowhere is exemplified by the new basing strategy (more to follow on this).’
    • ‘It is merely the latest in a series of clashes as the bipolar (West v East) Cold War institutional framework is reshaped by the pressures of today's unipolar (USA rules) world.’
    1. 1.1 Relating to or occurring in both North and South polar regions.
      ‘bipolar species’
      • ‘When our final Guggenheim on this planet opens in 2015 at the North Pole, we will at last have accomplished our goal of being not only global but bipolar.’
      • ‘The bipolar climate asynchrony in our scenarios is caused by the toggle between North Atlantic heat piracy and South Atlantic counter heat piracy.’
      • ‘Recent research on the Antarctic ice core points to the fact that both hemispheres are bound by a 'bipolar seesaw.'’
      • ‘The emerging view of a complex "bipolar climate machinery" urgently calls for a major international research effort to decipher and quantify the interplay of bipolar ice-ocean-atmosphere processes in climate evolution and sea level change during warm and cold climate conditions.’
      • ‘The millennial-scale asynchrony of Antarctic and Greenland climate records during the last glacial period implies that the global climate system acts as a bipolar see-saw driven by either high-latitudinal and/or near-equatorial sea-surface perturbations.’
  • 2(of psychiatric illness) characterized by both manic and depressive episodes, or manic ones only.

    • ‘Earlier this year, New York magazine asked on its cover: ‘Are you bipolar?’’
    • ‘The small study, published in the November issue of the Journal of Psychiatric Research, compared creativity test scores of children of healthy parents with the scores of children of bipolar parents.’
    • ‘The study also didn't explain or examine the 50 percent of bipolar people who do not have a history of serious childhood abuse.’
    • ‘He was discharged with a diagnosis of bipolar affective disorder with cannabis and nicotine dependence, given three psychiatric medications, and sent to a day therapy program, where he was seen for three weeks.’
    • ‘I forgive him, knowing he was bipolar, manic depressive, alcoholic.’
    • ‘An estimated 10-15 percent of adolescents with recurrent major depressive episodes develop bipolar I disorder.’
    • ‘There's no evidence to tie these events to a bipolar condition, and I haven't noticed bipolar tendencies in Tom.’
    • ‘Indeed, many bipolar patients report that manic episodes followed a period in which they were unable to sleep or endured jet lag.’
    • ‘The Eccleston Doctor's bipolar lurching from impish playfulness to sullen melancholy was given a motivation that added to the thematic richness of this particular adventure, whilst setting up an intriguing story arc.’
    • ‘And because he was bipolar, you never knew who you were going to get.’
    • ‘For those of you in the audience with no medical background, frontal lobe syndrome manifests itself in many ways that mimic the manic stage of bipolar disease.’
    • ‘When a 20-year-old bipolar guy gets sent to court in Alabama, he might not face the same consequences as his non-bipolar counterpart.’
    • ‘Instantly comes the witty retort: ‘Muir was probably bipolar.’’
    • ‘Mania is a component of manic depressive or bipolar disease.’
    • ‘It has become reasonably well accepted in the psychiatric literature that bipolar patients treated with an antidepressant for a depressive episode can be at risk to ‘switch’ into a manic episode.’
    • ‘I have only told the closest friends of my condition, save for a few times when I've met another bipolar person or someone who has actually experienced full-blown panic attacks.’
    • ‘I feel like it gives the general public this impression of bipolar people as insane maniacs who pose some kind of danger to ‘normal’ people.’
    • ‘He's bipolar, obviously well educated, and he feels not the least bit sorry for himself, despite the fact that fate has put him on a milk crate on a bridge on a cold November afternoon.’
    • ‘The diagnosis was acute bipolar and schizoaffective disorder.’
    • ‘I'm mentally ill with bipolar manic depression illness.’
    1. 2.1 (of a person) suffering from bipolar disorder.
      • ‘I think that being bipolar can be an asset for a writer.’
      • ‘She wasn't bipolar, or manic or anything like that.’
      • ‘Alcoholism among bipolar women, however, did not stem from family lineage.’
      • ‘She even gave him a short trial of lithium upon deciding he was bipolar.’
      • ‘Post et al reported in a double blind, placebo-controlled trial that in 35 bipolar depressed patients most had some improvement with carbamazepine.’
      • ‘The article also quoted a "friend" of Voorhies' saying she has a "terrible drug problem" and was "bipolar."’
      • ‘Two weeks later, I learned I was bipolar too; how ironic!’
      • ‘Keck et al were the first to attempt to utilize a loading dose strategy for valproate in bipolar manic patients.’
      • ‘And Alice Ripley, as reported, has sensational intensity as the bipolar mom.’
      • ‘My dad asked me if I had a choice not to be bipolar would I take it.’
      • ‘But he, in his customary bipolar (but tending manic) fashion, is making nice.’
      • ‘He says he was diagnosed as bipolar.’
      • ‘The children of parents with bipolar disorder were themselves either bipolar or had ADHD (attention deficit hyperactivity disorder).’
      • ‘If I'm bipolar now, will I be bipolar forever?’
      • ‘How long have you known you were bipolar?’
      • ‘She spent little time on psychiatric inpatient units working, for example, with bipolar patients in their active manic phases.’
      • ‘I was diagnosed bipolar in 1984.’
      • ‘I still feel really horrible sometimes, but I know it's all part of being bipolar.’
      • ‘Are more kids bipolar?’
      • ‘Berghofer et al followed 55 bipolar patients for a period that average 8.2 years.’
  • 3(of a nerve cell) having two axons, one either side of the cell body.

    • ‘The central processes of bipolar neurons constitute the auditory component of the eighth cranial nerve, which projects centrally to the cochlear nuclei.’
    • ‘Some bipolar naked nuclei and rare single intact epithelial cells were seen.’
    • ‘At goldfish retinal bipolar cells, the calcium requirement for physiological release rates is reported to be >100 M.’
    • ‘Most cells were either oval or spindle shaped, with bipolar cell processes.’
    • ‘These cells appeared mainly as thin and bipolar cells closely related to the hypertrophic nerve trunks.’
    • ‘Active movement is largely confined to each end of these elongated bipolar cells, enabling them to exert traction on the underlying substratum and to shuffle in between each other, always along the medio-lateral axis.’
    • ‘Occasionally, the dorsal bipolar neuron was duplicated.’
    • ‘Isolated retinal bipolar cells from tiger salamanders act like adaptive filters: at resting potential, their response gain and time constant are maximal, and transfer functions are lowpass.’
    • ‘The single SPB that is present at the beginning of the cell cycle must duplicate to generate the two poles of the bipolar spindle.’
    • ‘In past years evanescent wave microscopy was used to study the dynamics of vesicles in endocrine cells and in goldfish bipolar cell terminals.’
  • 4Electronics
    (of a transistor or other device) using both positive and negative charge carriers.

    • ‘A new design for a high voltage bipolar transistor is disclosed.’
    • ‘The distal portion of the cut nerve was placed over bipolar platinum electrodes and immersed in liquid paraffin warmed to 37 [degrees] C and contained in a bath that was formed by raising the skin flaps of the wound.’
    • ‘Thus, positive feedback between two bipolar junction transistors is reduced and then latch-up is eliminated.’
    • ‘A bipolar junction transistor is provided that includes an intrinsic collector region of first conductivity type in a semiconductor substrate.’
    • ‘The differential amplifier further includes a lateral bipolar transistor.’
    • ‘Developers of bipolar transistors have long been aware that the current flows must generate some light, comments Russell D. Dupuis of the Georgia Institute of Technology in Atlanta.’
    • ‘Toyota is already the world's largest producer of insulated-gate bipolar transistors, and they are working right now on the fourth generation nickel-hydride battery.’