lower in rank or length of service; subordinate

younger in years

of or relating to youth or childhood

of or relating to schoolchildren between the ages of 7 and 11 approximately

of, relating to, or designating the third year of a four-year course at college or high school

(in England) any barrister below the rank of Queen's Counsel

a junior person

a junior schoolchild

a junior student

being the younger: usually used after a name to distinguish the son from the father with the same first name or names