noun a younger person.
2. junior ·adj less advanced in age than another; younger.
3. junior ·noun belonging to a younger person, or an earlier time of life.
4. junior ·adj lower in standing or in rank; later in office; as, a junior partner; junior counsel; junior captain.
5. junior ·adj composed of juniors, whether younger or a lower standing; as, the junior class; of or pertaining to juniors or to a junior class. ·see junior, ·noun, 2.
6. junior ·noun hence: one of a lower or later standing; specifically, in american colleges, one in the third year of his course, one in the fourth or final year being designated a senior; in some seminaries, one in the first year, in others, one in the second year, of a three years' course.