vac·u·um¹/`vækjəm; ˈvækjuəm/ n 1 [C] a vacuum cleaner 真空吸尘器 2 [C] a space that is completely empty of all air or gas 真空 3 [singular 单数] a situation in which someone or something is missing or lacking 失落感; 空虚: His death left a vacuum in her life. 他的去世使她的生活变得空虚。