(1):

(n.) A young person; especially, a young man.

(2):

(n.) The part of life that succeeds to childhood; the period of existence preceding maturity or age; the whole early part of life, from childhood, or, sometimes, from infancy, to manhood.

(3):

(n.) The quality or state of being young; youthfulness; juvenility.

(4):

(n.) Young persons, collectively.

(5):

(pl.) of Youth