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English definition of “penetration”

penetration

noun [U] (MOVEMENT INTO)    /ˌpen.ɪˈtreɪ.ʃən/
a movement into or through something or someone: Sunscreens can help reduce the penetration of ultraviolet rays into the skin. The company is trying to increase its penetration of the market.Crossing and moving through the act of a man putting his penis into his partner's body during sexSexual intercourse
(Definition of penetration noun (MOVEMENT INTO) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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