penetrationpen‧e‧tra‧tion /ˌpenəˈtreɪʃən/ noun 
1[countable, uncountable] when something or someone enters or passes through something, especially when this is difficult: 
Cover the entire device to prevent water penetration.penetration of The attack failed to lead to any deep penetration of enemy territory.2[countable, uncountable] the degree to which a product is available or sold in an areapenetration of the rise in import penetration of the domestic market3[uncountable] when a system of beliefs enters a society and becomes acceptedpenetration of 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 informationpenetration of foreign penetration of the British secret service5[uncountable] when a man puts his penis into a woman’s vagina or into someone’s anus6[uncountable] a special ability to understand things very clearly and completely
1[countable, uncountable] when something or someone enters or passes through something, especially when this is difficult: Cover the entire device to prevent water penetration.penetration of The attack failed to lead to any deep penetration of enemy territory.2[countable, uncountable] the degree to which a product is available or sold in an areapenetration of the rise in import penetration of the domestic market3[uncountable] when a system of beliefs enters a society and becomes acceptedpenetration of 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 informationpenetration of foreign penetration of the British secret service5[uncountable] when a man puts his penis into a woman’s vagina or into someone’s anus6[uncountable] a special ability to understand things very clearly and completely