American Dictionary of the English Language

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PEN'ETRATE, verb transitive [Latin penetro, from the root of pen, a point.]

1. To enter or pierce; to make way into another body; as, a sword or dart penetrates the body; oil penetrates wood; marrow, the most penetrating of oil substances.

2. To affect the mind; to cause to feel. I am penetrated with a lively sense of your generosity.

3. To reach by the intellect; to understand; as, to penetrate the meaning or design of any thing.

4. To enter; to pass into the interior; as, to penetrate a country.

PEN'ETRATE, verb intransitive To pass; to make way.

Born where heaven's influence scarce can penetrate

1. To make way intellectually. He had not penetrated into the designs of the prince.