Obs. rare. [ad. med.L. acuitiōnem sharpening, f. acu-ĕre, as if f. a ppl. stem *acuit- for acūt-.] The act of sharpening.

1

1753.  Chambers, Cycl. Supp., s.v., Acuition, in a general sense, the same with acuating or sharpening … The Acuition, says Gaza, is where the sound is highest in the pronunciation of a word … Acuition, in medicine and chemistry, is used for sharpening or increasing the force of any medicine.

2