IPA: /prɪˈzʌmp.tɪv.li/
KK: /prɪˈzʌmp.tɪv.li/
In a way that is based on what is assumed or believed to be true, rather than what is known for certain.
The evidence was presumptively accepted by the jury during the trial.
Presumptively → It is formed from "pre-" (meaning before) and "sumere" (meaning to take). The word "presumptively" means to take something as true or likely before having all the evidence.
Think of 'taking' ('sumere') something 'before' ('pre-') it is fully proven — that's why presumptively means to assume something is true.