Definition of acumination in English:

acumination

noun

obsolete Mineralogy
  • 1Zoology Botany
    A pointed or tapering part; (Mineralogy) †a part of a crystal regarded as notionally resulting from acumination (obsolete). Now chiefly Botany and Zoology.

  • 2figurative
    The action of giving a point to something or bringing something to a point (chiefly figurative); (Mineralogy) †the notional replacement of an angle or plane of a crystal by three or more planes meeting in a point (obsolete).

Origin

Mid 17th century. From post-classical Latin acumination-, acuminatio action of sharpening, sharpness, pointedness from acuminat-, past participial stem of acuminare to sharpen + classical Latin -iō.

Pronunciation:

acumination

/əˌkjuːmɪˈneɪʃn/