The phrase "authoritative confirmation" is correct and usable in written English.
It can be used when referring to a reliable or official verification of information or facts.
Example: "The scientist provided an authoritative confirmation of the study's findings, ensuring the results were credible."
Alternatives: "official verification" or "reliable affirmation".
"This is the first authoritative confirmation we've had that the main impediment to sale is the interest rate protection in place for existing borrowers.
Dr Jonathan Romain, chairman of Accord - which campaigns for equal access to faith schools, said; "At last we have authoritative confirmation that the countless anecdotes about religious discrimination by faith schools are based on fact.
If the account Mr. Mahmoud has provided to his interrogators is true, it would be the most authoritative confirmation that neither Mr. Hussein nor his sons were killed in American attacks in March and April.
Mexicans are eagerly reading the new autobiography of former President Miguel de la Madrid for its authoritative confirmation of one of the most flagrant electoral frauds of modern times -- the stealing of Mexico's 1988 presidential election by the ruling-party candidate, Carlos Salinas de Gortari.
This now is the first independent and authoritative confirmation that there is "clear and convincing evidence" that chemical weapons were used on 21 August.
"We've reached a whole new level of conspiratorial thinking," Mann added, "a brave new world of epistemic closure where the more authoritative the confirmation of our scientific understanding, the deeper and wider the conspiracy simply must extend".
There was no independent confirmation of the casualty figures, but a authoritative pro-rebel Web site confirmed that a battle had taken place.
We found that – to be a practical expression of the right to health – at least one element is missing in present authoritative definitions of universal health coverage: a straightforward confirmation that international assistance is essential, not optional.
Authoritative! Hidebound!
Authoritative and impressive.
