Definition of post-pubescent in US English:

post-pubescent

adjective

  • Of a young person: having (especially recently) been through puberty. Also: of or characteristic of the period in a person's life immediately following puberty.

noun

  • A young person who has (recently) been through puberty.

Origin

Early 20th century; earliest use found in American Anthropologist. From post- + pubescent.

Pronunciation

post-pubescent

/ˌpəʊs(t)pjʊˈbɛsnt/