-(p)tiv, -tēv also -təv adjective
Etymology: Medieval Latin praesumptivus, from Late Latin, presumptuous, from Latin praesumptus (past participle of praesumere to anticipate, suppose, take in advance) + -ivus -ive
1.
a. : giving grounds for reasonable opinion or belief
presumptive evidence
an extremely strong presumptive case is made out — J.A.Hobson
b. : based on probability or presumption
the presumptive heir
2.
[probably from Late Latin praesumptivus ]
archaic : presumptuous
3. : based on inference : apparent , presumed
the presumptive visit cannot be established as certain
4. embryology
a. : expected to develop in a particular direction under normal conditions
presumptive region of the blastula
b. : being the embryonic precursor of
presumptive neural tissue