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pen‧e‧tra‧tion
1 [uncountable and countable] when something or someone enters or passes through something, especially when this is difficult : Cover the entire device to prevent water penetration.
Cover the entire device to prevent water penetration.2 [uncountable and countable] the degree to which a product is available or sold in an area
penetration of the rise in import penetration of the domestic market
the rise in import penetration of the domestic market3 [uncountable] when a system of beliefs enters a society and becomes accepted
penetration of the penetration of Marxism into Latin America
the penetration of Marxism into Latin America4 [uncountable] when someone joins and gets accepted by an organization, business etc in order to find out secret information
penetration of foreign penetration of the British secret service
foreign penetration of the British secret service5 [uncountable] when a man puts his penis into a woman's vagina or into someone's anus
6 [uncountable] a special ability to understand things very clearly and completely
