Definition of defencist in US English:

defencist

(also defensist)

noun

Russian History
  • Towards the end of the First World War (1914–18): a supporter of the continuation of hostilities by Russia against the Central Powers, rather than the conclusion of a separate peace.

adjective

Russian History
  • Designating the attitude or policy of supporting the continuation of hostilities by Russia against the Central Powers towards the end of the First World War (1914–18), rather than the conclusion of a separate peace.

Origin

Early 20th century; earliest use found in New Europe. From defence + -ist, after Russian oborončeskij.

Pronunciation

defencist

/dɪˈfɛnsɪst/