The phrase "a definite impact of" is correct and usable in written English.
It can be used when discussing the specific and clear effects or consequences of something on a particular subject or situation.
Example: "The study revealed a definite impact of climate change on local wildlife populations."
Alternatives: "a clear effect of" or "a significant influence of".
The strike had a definite impact on the economy of Los Angeles, where many of the commercials are filmed.
Although there was no apparent change in the proportion of stages in our study, early diagnosis has a definite impact on the prognosis of NPC.
"The original bill, though flawed, had a definite impact on the number of these weapons faced by the police on streets and used in crimes," said Adam Eisgrau, who helped write the 1994 ban while serving as Judiciary Committee counsel to Ms. Feinstein.
The combination of these variables with themselves is often meaningless (the predictive and dependent variables are collinear), however shunt failure has in itself a definite impact on the risk of further shunt failure.
This will have a definite impact on the overall design of the organization's security infrastructure.
These effects have a definite impact on stability and power quality of grid operation.
The statistical significance of the overall intra-group differences though shows that the treatment had a definite impact on the vertical skeletal dimension of the non-extraction patients by increasing it.
"You also have to consider that the aerobics craze took a lot of people away from racquetball". Aerobics and body building, particularly the emphasis on Nautilus training, "had a definite impact" on racquetball, said Chuck Leve, editor of National Racquetball Magazine.
Attitude Toward Using Technology is another main construct that had a definite impact on the sample's adoption of robotic technology.
What all of this suggests, Dr. Hagobian of Cal-Poly says, is that "exercise has a definite impact on food reward regions.
