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The Collaborative International Dictionary
Perceptibleness

Perceptible \Per*cep"ti*ble\, a. [L. perceptibilis: cf. F. perceptible. See Perceive.] Capable of being perceived; cognizable; discernible; perceivable.

With a perceptible blast of the air.
--Bacon. [1913 Webster] -- Per*cep"ti*ble*ness, n. -- Per*cep"ti*bly, adv.

Wiktionary
perceptibleness

n. The state of being perceptible.