espionage
/ˌespɪəˈnɑːʒ/noun
mass noun
- the practice of spying or of using spies, typically by governments to obtain political and military information（尤指政府为获取政治和军事情报而进行的）间谍活动。
词源
late 18th cent.: from French espionnage, from espionner 'to spy', from espion 'a spy'.