/ prɪˈzʌmptɪv; NAmE / adjective
[ usually before noun ] ( formal or technical ) likely to be true, based on the facts that are available
—see also heir presumptive
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WORD ORIGIN
late Middle English : from French présomptif , -ive , from late Latin praesumptivus , from praesumpt- taken before, from the verb praesumere anticipate (in late Latin take for granted), from prae before + sumere take.