noun

• The act of penetrating something.
• Specifically, the insertion of the penis (or similar object) during sexual intercourse.
• The act of penetrating a given situation with the mind or faculties; perception, discernment.
• (blackjack) A number or fraction that represents how many cards/decks will be dealt before shuffling, in contrast to the total number of cards/decks in play.
• (marketing) The proportion of the target audience who buy or use the specified product or service.