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penetration

mastery

UK /pɛ.nɪˈtɹeɪ.ʃən/ US /pɛ.nəˈtɹeɪ.ʃən/noun

card 1 of 8 · synonym

Which word is closest in meaning to 'penetration' in this sentence?

The military's penetration into the hostile territory was rapid and decisive.