Definition of unicity in English:

unicity

noun

rare
  • 1[mass noun] The fact of being or consisting of one, or of being united as a whole.

    ‘the presbyterial and episcopal service is not humanly viable unless by rediscovering the unicity of the priesthood’
    1. 1.1The fact or quality of being unique.
      ‘Aqina's novel doctrine of the unicity of forms’
      • ‘This is a general phenomenon in the whole secularist press: instead of a thorough analysis and a lively debate worthy of the importance and unicity of the report, the page is turned as quickly as possible.’
      • ‘This is not merely a question of terminology, but above all of respecting a basic truth of the Catholic faith: that of the unicity [unique nature] of the Church of Jesus Christ.’

Pronunciation:

unicity

/juːˈnɪsɪti/