出典:Wiktionary
出典:『Wiktionary』 (2026/04/11 02:46 UTC 版)
From 中期英語 penetracioun, from Old French penetracïon, and its source, Latin penetrātiō, from the participle stem of penetrō (“pierce”, verb). Morphologically penetrate + -ion.
penetration (countable and uncountable, plural penetrations)
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