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Webster 1913 Edition

Noun.

A sharpening; termination in a sharp point; a tapering point.

Bp. Pearson.

Noun.

A sharpening; termination in a sharp point.

acumination ‎(plural acuminations)

A sharpening; termination in a sharp point; a tapering point.
- Bishop Pearson
  The coronary thorns did not only express the scorn of the imposers by that figure into which they were contrived, but did also pierce his tender and sacred temples to a multiplicity of pains, by their numerous acuminations.