Definition of diffidation in US English:

diffidation

noun

historical
  • The formal renunciation or dissolution of a relationship of amity, trust, allegiance, or fealty.

Origin

Mid 17th century. From post-classical Latin diffidation-, diffidatio defiance, renunciation of allegiance from diffidat-, past participial stem of diffidare + classical Latin -iō.

Pronunciation

diffidation

/ˌdɪfɪˈdeɪʃn/