IPA: /ˈfæktəm/
KK: /fæktəm/
A thing that has been done or a fact that is established, often used in legal contexts to refer to the facts of a case.
The lawyer presented the factum to support her argument in court.
Factum is derived from the Latin root "facere" (meaning to do or make) and the suffix "-um" (which indicates a noun). The word "factum" refers to something that has been done or made, essentially meaning a deed or act.
Think of 'doing' or 'making' something, as 'facere' means to do, and 'factum' refers to something that has been done.