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American Dictionary of the English Language

Webster's Dictionary 1828

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Imperceptible


IMPERCEP'TIBLE, adjective

1. Not to be perceived; not to be known or discovered by the senses. We say a thing is imperceptible to the touch, to the eye or sight, to the ear, to the taste or smell. Hence,

2. Very small; fine; minute in dimensions; or very slow in motion or progress; as, the growth of a plant or animal is imperceptible; it is too slow to be perceived by the eye.

IMPERCEP'TIBLE, noun That which cannot be perceived by the senses on account of its smallness. [Little used.]