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per·cep·ti·ble (pər-sĕptə-bəl)
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adj.
Capable of being perceived by the senses or the mind: perceptible sounds in the night.

[Late Latin perceptibilis, from Latin perceptus, past participle of percipere, to perceive; see PERCEIVE.]

per·cepti·bili·ty n.
per·cepti·bly adv.

Synonyms: perceptible, palpable, appreciable, noticeable, discernible
These adjectives apply to what is capable of being apprehended as being real through the senses or by the mind. Perceptible is the least specific: a perceptible pause in the flow of his speech.
Palpable applies both to what is perceptible by means of the sense of touch and to what is readily perceived by the mind: "The advantages Mr. Falkland possessed ... are palpable" (William Godwin).
What is appreciable is capable of being estimated or measured: dumping appreciable amounts of waste into the harbor.
Noticeable means easily observed: noticeable shadows under your eyes.
Discernible means distinguishable, especially by sight or by the intellect: no discernible progress in the contract negotiations.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2017 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 

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