Definition of dilation in US English:



  • 1Physiology
    The action or condition of becoming or being made wider, larger, or more open.

    ‘nitric oxide causes dilation of the blood vessels’
    ‘dilation of the pupils of the eye’
    • ‘Nitric oxide is a free radical that promotes infection resistance and blood vessel dilation.’
    • ‘If dilation is not performed carefully the results may be disastrous.’
    • ‘A relaxation of cervical smooth muscle facilitates dilation.’
    • ‘Expansion of the brachial pathway indicates dilation is occurring in the coronary arteries that supply the heart.’
    • ‘Manual dilation often requires general anesthetic and admission to the hospital.’
    • ‘Many mothers get an urge to push at this time even though complete dilation may not have taken place.’
    • ‘If obstruction is confirmed, balloon dilation or surgery are necessary’
    • ‘She therefore underwent dilation and curettage to remove fragmented placental tissue.’
    • ‘He was discharged and scheduled for repeat dilation and possible stent placement in 3 weeks.’
    • ‘Surgical dilation or release of the internal sphincter has been the traditional treatment of chronic or severe fissures.’
  • 2dilation onThe action of speaking or writing at length on (a subject)

    ‘the main editorial involved no dilation on the privileges or responsibilities of citizenship’
    ‘dilations on Alpha Male psychology aren't overdone’
    • ‘Bantock's setting of his wife's dilations on Sappho was supremely seductive to the Edwardian England of its day.’
    • ‘The editorial involved no dilation on the privileges or responsibilities of citizenship or the significance and greatness of our history.’
    • ‘Her dilation on these opinions seemed to carry us to about 8.30 without any awareness of the passage of time.’
    • ‘When dilations on the nature of truth appear, the book begins to feel like a solid magazine piece stretched thin.’
    • ‘The channel aired clips of his endless dilation, in which he prefaced his questions with two or three minutes of dependent clauses before getting lost.’