security/sIˋkjUrətI; sIˈkjʊərəti or sIˈkjʊərIti/n [U] 1 the things you do to keep someone or something safe from danger or crime 安保措施﹐安全工作: the man in charge of airport security 负责机场安全工作的那个人Security around the President has been tightened . 总统的安全措施加强了。security cameras 安保摄像机2 when you are not likely to lose something, or something is not likely to fail 保护﹔保障: People want job security . 人们希望有工作保障。financial security 经济保障3 a feeling of being safe, confident, and free from worries 安全感: Children need a sense of security. 儿童需要有安全感。4 something valuable that you promise to give to someone if you fail to pay back money you have borrowed 抵押品: You can use your house as security for the loan. 你可以用自己的房子抵押贷款。