Definition of theorematically in US English:

theorematically

adverb

rare
  • By means of a theory or theorem; by means of deduction.

Origin

Mid 17th century; earliest use found in Thomas Urquhart (1611–1660), author and translator. Either from theorematic + -ally, or from theorematical + -ly.

Pronunciation

theorematically

/ˌθɪərəˈmatɪkli/