adjective
putative
PYOO-tuh-tiv/ˈpjuːtətɪv/
Generally believed or claimed to be so, but not proven.
Spectators gather around the putative winner while the official checks the close finish.

Etymology
Latin putare supplies the idea of judging or supposing, so putative describes what people take something to be, not necessarily what it is. Early use included marriages entered in good faith but legally invalid.
In context
a putative father must register no later than 15 days after the baby's birth in order to preserve his rights
More examples
- Researchers are testing the putative link between the chemical and memory loss.
- A DNA test rules out the child's putative father.
- The putative heir must prove her claim to the estate.