Definition of unprecedential in US English:

unprecedential

adjective

  • Unprecedented. Also Law: that does not constitute a precedent.

Origin

Early 18th century; earliest use found in John Evelyn (1620–1706), diarist and writer. From un- + precedential.

Pronunciation

unprecedential

/(ˌ)ʌnˌprɛsɪˈdɛnʃl/