noun which may take the genitive case particle 'no', adverb
fully fledged; competent; proper
Describes someone or something that has reached a respectable, full-fledged level, often with a nuance of 'in one's own right' or 'as much as anyone else'. Used adverbially or with の.
He has become a fully fledged adult, too.
You've started talking like a proper grown-up, haven't you?
Rare kanji spelling; easily confused with 一端 (いったん).
From 一端（いっぱし）, literally “one part” or “one person’s share.” It developed the sense of having the standing or competence of a full-fledged person.