Longman Dictionary of Contemporary English homepage

penetration

noun
     
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.
penetration of
The attack failed to lead to any deep penetration of enemy territory.
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
3 [uncountable] when a system of beliefs enters a society and becomes accepted
penetration of
the penetration of Marxism into Latin America
4 [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
5 [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

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