n A male child, a boy or man in relation to his parents; one's male offspring.
n A male adopted person in relation to his adoption parents.
n A male person who has such a close relationship with an older or otherwise more authoritative person that he can be regarded as a 'son' of the other person.
n A male person considered to have been significantly shaped by some external influence.
n (non-gloss definition|A familiar address to a male person from an older or otherwise more authoritative person.)
n (UK|colloquial)(non-gloss definition|A friendly address to a person of equal authority.)