Definition of "confirm"

She pulled through with the boy till he was confirmed; but then she told him that she could not feed him any longer; he would have to go out and earn his own bread.

1886, Peter Christen Asbjørnsen, translated by H.L. Brækstad, Folk and Fairy Tales, page 215

Elizabeth, daughter of Henry VIII, was baptized and confirmed at the age of three days.

1971, Keith Thomas, Religion and the Decline of Magic, Folio Society, published 2012, page 35

Despite all the evidence confirming the existence of the Protheans, little is known about their culture and society. From time to time, dig sites will yield new clues, but after 50,000 years of decay, little of value is unearthed.

2008, BioWare, Mass Effect (Science Fiction), Redwood City: Electronic Arts, PC, scene: Protheans: Data Discs Codex entry

The little green men were clearly professional soldiers by their bearing, carried Russian weapons, and wore Russian combat fatigues, but they had no identifying insignia. Vladimir Putin originally denied they were Russian soldiers; that April, he confirmed they were.

2019 March 18, Steven Pifer, Five years after Crimea’s illegal annexation, the issue is no closer to resolution‎, The Center for International Security and Cooperation

Transport Minister Marples, meanwhile, used arrogant rhetoric and showed his personal contempt for railways when confirming in Parliament that a third of the network was to be closed even before the survey results were known.

2023 March 8, Howard Johnston, “Was Marples the real railway wrecker?”, in RAIL, number 978, page 53

That ex-lecturer-to-be confirm gone case liao.

2006, DanielS, soc.culture.singapore (Usenet)