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Definition of imperceptible

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im·per·cep·ti·ble  audio  (mpr-spt-bl) KEY  

ADJECTIVE:
  1. Impossible or difficult to perceive by the mind or senses: an imperceptible drop in temperature.
  2. So subtle, slight, or gradual as to be barely perceptible: an imperceptible nod.


OTHER FORMS:
imper·cepti·bili·ty or imper·cepti·ble·ness (Noun), imper·cepti·bly (Adverb)


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The American Heritage® Dictionary of the English Language, Fourth Edition.
Copyright © 2000 by Houghton Mifflin Company.
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