This is the 8691st most frequent Polish word.
rapportem
"Rapportem" means "with a report" or "by report" in Polish.
The word 'raportem' is used as a noun (report) in the instrumental case indicating that the action relates to the report.
Muszę dokładnie zapoznać się z tym raportem.
I need to thoroughly familiarize myself with this report.
Here, 'raportem' again appears as a noun in the instrumental case, indicating the means by which the presentation was illustrated.
Prezentacja była zilustrowana szczegółowym raportem.
The presentation was illustrated with a detailed report.
The word 'raport' without diminutive form in ablative case was used to show beloning.