The phrase "definitively about" is correct and can be used in written English.
It is typically used to describe something that is certain or conclusive. Example: The movie's ending was definitively about the power of love and forgiveness, leaving no doubt in the audience's mind.
In the end, the two actors conclude they can conclude very little definitively about the former owners of these lockers.
Brad Grey, chief executive of the production company that produces "The Sopranos" with HBO, spoke more definitively about the idea.
"We will wait until Congress has definitively said no to a well-thought-out plan with numbers attached to it before we say anything definitively about my executive authority here," President Obama said this past December.
He will speak "pretty definitively" about changes to the NSA's bulk collection of metadata program in January, he's gone over the White House review and consulted with all the right people about changes.
Mr. Giuliani's aides, who acknowledged that he had been talking more definitively about running for the Senate in recent days, have also hinted that the mayor might seek an alternative to a formal declaration of his campaign.
What we have learned definitively about him so far — and what may most account for his victory, should he achieve it — is that he had both the brains and the muscle to outsmart, outmaneuver and outlast some of the smartest people in the country, starting with the Clintons.
We knew what it was about,' definitively states Bob's old Trench Town neighbour Michael Smith, of the group Knowledge.
This is definitively not about creating the architectural equivalent of the hair shirt, but about making the best possible contexts for the things that matter in life, on paring back the accretions of surface and behaviour to what is essential: the glory lies not in the act of removal, but in the experience of what is left.
As she was illiterate and unable to record her own history, little is definitively known about many details of Tubman's life, Larson said.
If there is anything definitively male about the matchup, it is that Geno Auriemma and Jeff Walz represent only the second all-guy women's coaching final.
"What are the effects of having so much plastic floating around in the ocean, for example, and what can we definitively say about the health effects of Chernobyl's radioactive environment on the people and animals that remain there?
