Translation guide
The English word 'junior' can refer to a younger person, someone of lower rank, or a student in their third year of high school or college. This guide covers natural Japanese expressions for each meaning.
Referring to someone younger than oneself, often in school, family, or social contexts.
Refers to a junior in school, club, or workplace. Implies a hierarchical relationship where the junior is expected to show respect.
彼は私の後輩です。
He is my junior (at school/work).
後輩に仕事を教える。
Teach a junior how to do the work.
Simply means 'younger' in age. Can be used for anyone younger, not necessarily in a hierarchical relationship.
彼は私より年下です。
He is younger than me.
A person who is younger. More neutral than 後輩.
年下の人と話すのが苦手です。
I'm not good at talking to people younger than me.
Someone with less experience, lower position, or subordinate role in an organization.
A subordinate in a workplace. Implies a direct reporting relationship.
彼は私の部下です。
He is my subordinate.
Can also be used in workplace contexts for someone who joined after you, regardless of age.
A person of lower status or younger age. Formal and somewhat old-fashioned.
目下の人にも丁寧に接する。
Treat even those of lower status politely.
Specifically referring to a student in their third year of high school or college in the US system.
High school junior (third year). In Japan, high school is three years, so this is the final year.
彼は高校3年生です。
He is a junior in high school.
College junior (third year).
大学3年生の時に留学しました。
I studied abroad when I was a junior in college.
Generic 'third-year student'. Context clarifies the school level.
Used after a name to indicate a son with the same name as the father.
Japanese does not have a direct equivalent. You can say '〜ジュニア' as a loanword or explain '父と同名の息子' (son with the same name as the father).
彼はジョン・スミス・ジュニアです。
He is John Smith Jr.
彼は父と同名で、ジュニアと呼ばれています。
He has the same name as his father and is called Junior.
The loanword ジュニア is not used for school years in Japanese. Use 3年生 instead.
後輩 implies a hierarchical relationship (senior-junior) often in school or work. 年下 simply means younger in age and can be used for anyone.
後輩の面倒を見る。
Look after one's juniors.
彼は3年生です。
He is a junior (third-year student).