senior 
英 [ˈsiːnjə]  美 [ˈsinjər] 
n. 较年长的人；高年级学生；上司

adj. 较年长的；较高的；资历较深的

例句：
There was an attempted coup in which senior officers were involved. 

高级军官参与政变未遂。

She was promoted to a more senior post. 

她被提拔到一个更高的职位。

Although he only joined the firm last year, he's senior to me already. 

尽管他去年刚进公司，但职位已经比我高了。

He is the senior of the two. 

他是两人中年龄较大的。

She is three years my senior. 

她比我大三岁。