Definition of O'Brienism in US English:

O'Brienism

noun

  • The anti-Union policy of William O'Brien, especially the extreme nationalism espoused by him in the British Parliament from the general election of 1892 to around 1901.

Origin

Late 19th century; earliest use found in Globe & Traveller. From the name of William O'Brien, Irish nationalist leader + -ism.

Pronunciation

O'Brienism

/ə(ʊ)ˈbrʌɪənɪz(ə)m/