Definition of presumptive
1
: based on probability or presumption
the presumptive nominee/winner
— see also heir presumptive
2
: giving grounds for reasonable opinion or belief
A blood alcohol concentration of 0.08 percent is considered presumptive evidence of drunken driving in Louisiana for those 21 and older.— Joe Gyan Jr. He was admitted to the hospital with a presumptive diagnosis of cellulitis.— Mary Jo Bonner … health departments in 20 states reported 100 presumptive or confirmed human cases of arboviral disease … — The Journal of the American Medical Association
3
: being an embryonic precursor with the potential for forming a particular structure or tissue in the normal course of development
presumptive retina
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Time Traveler for presumptive
The first known use of presumptive was in the 15th century
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