知命zhīmìng〈书fml.〉 1.了解天命;认识命运{understand the will of heaven; know one's destiny}: 乐天～。{be contented with one's lot} 2.《论语·为政》: ‘五十而知天命。’后来用‘知命’指人五十岁{age of 50. The Analects·Governance: ‘At 50 I understood the Decree of Heaven.’}: ～之年。{at the age of 50}