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Webster 1913 Edition

Noun.

Openness; frankness.

[Archaic]

Noun.

[L. apertus.] Openness. [Rarely used.]

apertness ‎(uncountable)

(archaic) openness; frankness
(Can we find and add a quotation of Theodore Edward Hook to this entry?)
- Holder
  The freedom or apertness and vigour of pronouncing, as in the Bocca Romana, and giving somewhat more of aspiration; and the closeness and muffling, and laziness of speaking, render the sound of speech different.