Longman Dictionary of Contemporary English homepage

perceptible

 adjective
     
per‧cep‧ti‧ble formal
something that is perceptible can be noticed, although it is very small [≠ imperceptible]:
a small but perceptible change
The sound was barely perceptible.
—perceptibly adverb:
the light dimmed perceptibly
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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