Japan proper (sometimes excluding the Ryukyu islands and other remote islands); mainland Japan
decisive mainland battle (land battle envisioned late in World War II)
mainland China; China proper
mainlander; person from the mainland
continental United States; mainland United States
mainland dialects (of Japanese, as opposed to the Ryukyu languages)
National Missile Defense (US); NMD
US mainland; American mainland
US mainland; mainland United States