adj.

1.[senior (to sb)]较年长的；（级别﹑ 权位等）较高的；（做某工作等）年资较深的

2.(常作Senior，缩写 Sen) (置於姓名之後) （父或母与子女同名情况下的）父或母

3.[attrib 作定语]（指学校）高年级的（学生年龄在11岁以上的）

n.

1.较年长的人

2.高年级学生

3.【美】（中学或大学的）毕业班的学生 [attrib 作定语] （her senior year at college）

英语解释

an undergraduate student during the year preceding graduation

advanced in years; (aged' is pronounced as two syllables)

older; higher in rank; longer in length of tenure or service

a person who is older than you are

used of the fourth and final year in United States high school or college