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To enter or force a way into; pierce.
(verb-transitive)
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To enter into and permeate: The insistent rhythm of piano practice penetrated each room of the house.
(verb-transitive)
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To cause to be permeated or diffused; steep.
(verb-transitive)
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To insert the penis into the vagina or anus of.
(verb-transitive)
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To enter (an organization, for example), usually surreptitiously, so as to gain influence or information; infiltrate.
(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.