The phrase "a matter of substantial" is correct and usable in written English.
It can be used when discussing something that is significant or important in a particular context.
Example: "The decision to invest in renewable energy is a matter of substantial importance for our future."
Alternatives: "a significant issue" or "a considerable concern".
But the Court of Appeals found that the law "addresses a matter of substantial state concern".
"Clearly, a tax paid only by New York State residents who live outside New York City is a matter of substantial state concern," he wrote.
Both of the recent decisions invoking home rule issues hinged on whether the issue being addressed was a matter of "substantial state concern".
State courts have repeatedly held that local economic issues can have implications so broad that they become a matter of substantial state interest, he said.
"To the contrary, the proposed gag order violates the First Amendment, as it interferes with both the public's right to obtain truthful information about a matter of substantial public debate and service providers' rights to publish such information".
Whether Bin Ladin and his organization had roles in the 1993 attack on the World Trade Center and the thwarted Manila plot to blow up a dozen U.S. commercial aircraft in 1995 remains a matter of substantial uncertainty.
The current Labour rules, introduced in 2013, state that an MP with a substantial territorial interest in a new constituency may seek selection as a matter of right - a substantial territorial interest is defined as 40% or more of the previous constituency.
But it is a matter of fact that substantial differences in the level of among-population differences across loci exist [ 3].
Witness testimony that's clearly wrong as a matter of fact cannot be substantial evidence.
These seemingly cosmetic changes halved the number of complaints to the call center in a matter of months which translated to substantial cost savings and fewer delayed payments.
And in retrospect it was no surprise once Google acquired YouTube for $1.6 billion last fall, it was only a matter of time before a substantial media player took the company to court to extract a payout.
