a.

1. 年纪较轻的[（+to）]
   He is junior to me by two years.

   他比我小两岁。

2. 资浅的；地位较低的；晚辈的[（+to）]
   My cousin is a junior officer.

   我表弟是个下级军官。

3. 【美】（四年制大学或中学中）三年级（生）的
4. （置于姓名后表示同名父子中的子或同姓两人中的较年幼者，略作Jr.或jr.）小
   Mr. Smith Junior is in charge of this department.

   小史密斯先生负责这个部门的工作。

n.

1. 较年少者
   I am three years her junior.

   我比她小三岁。

2. 等级较低者；晚辈
   Of the two clerks, he is the junior.

   这两个职员中他职务较低。

3. 三年级生
4. 【美】【口】儿子；小伙子

adj.

1. for or denoting young or younger people.
   ▸Brit. for or denoting schoolchildren aged 7–11.
   ▸N. Amer. of or for students in the third year of a four-year course at college or high school.
2. [postpos.] denoting the younger of two with the same name in a family.
3. low or lower in rank or status.

n.

1. a person who is a specified amount younger than someone else:
   he's five years her junior.
2. Brit. a child at a junior school.
   ▸N. Amer. a student in the third year at college or high school.
   ▸(in sport) a young competitor, typically under 16 or 18.
   ▸N. Amer. informal a nickname for one's young son.
3. a person of low rank or status.