/prəˈtekʃn ||; prəˈtɛkʃən/noun [U] protection (against/from sth) the act of keeping sb/sth safe so that he/she/it is not harmed or damaged 保护；防御: Vaccination gives protection against diseases. 接种痲疹疫苗可预防痲疹。After the attack he was put under police protection. 他遇袭后便受到警方的保护。