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Definition of: imperceptible
(im′pər·sep′tə·bəl) adjective
That cannot be perceived, as by reason of smallness, extreme tenuity or delicacy, distance or gradual progress; inappreciable by the mind or sense; undiscernible: an imperceptible change. [<F <L imperceptibilis]
—im′per·cep′ti·ble·ness, im′per·cep′ti·bil′i·ty noun
—im′·per·cep′ti·bly adverb
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