This is the 2349th most frequent Russian word.
научный
Scientific.
Here, "научный" describes the report, indicating that it is related to the field of science.
Он написал научный отчет.
He wrote a scientific report.
In this sentence, "научный" qualifies the fact as pertaining to or derived from science.
Это научный факт, который был доказан экспериментами.
This is a scientific fact that has been proven by experiments.
"Научный" in this context characterizes the approach as systematic and based on scientific principles.