Etymology
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intestate (adj.)
late 14c., from Old French intestat (13c.) and directly from Latin intestatus "having made no will," from in- "not" (see in- (1)) + testatus, past participle of testari "make a will, bear witness" (see testament). As a noun, "one who has not made out a will," from 1650s.
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intestacy (n.)
"condition of dying without leaving a valid will," 1740, from intestate + -acy.
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