[ C ] someone who has a job at a low level within an organization地位（或等级）较低者；年资较浅者，晚辈

[ C ] UK a student at a junior school小学生

[ C ] US a student in the third year of a course that lasts for four years at a school or college（美国四年制中学或大学的）三年级学生

[ C ] a young person below a particular age who is involved in an activity, especially sport初级者（参与某项活动，尤其是体育活动时低于特定年龄的年轻人）

[ S ] mainly US used to refer to your son（用于指自己的）儿子

B2 low or lower in rank地位（或等级）较低的；年资较浅的

B2 connected with or involving young people below a particular age初级的（低于特定年龄的）

UK written abbreviation Jnr, US written abbreviation Jr. used after a man's name to refer to the younger of two men in the same family who have the same name（置于姓名后表示家庭同名两人中的较年幼者）小