Etymology
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testament (n.)

late 13c., "last will disposing of property," from Latin testamentum "a last will, publication of a will," from testari "make a will, be witness to," from testis "witness," from PIE *tri-st-i- "third person standing by," from root *tris- "three" (see three) on the notion of "third person, disinterested witness."

Use in reference to the two divisions of the Bible (early 14c.) is from Late Latin vetus testamentum and novum testamentum, loan-translations of Greek palaia diatheke and kaine diatheke. Late Latin testamentum in this case was a confusion of the two meanings of Greek diatheke, which meant both "covenant, dispensation" and "will, testament," and was used in the former sense in the account of the Last Supper (see testimony) but subsequently was interpreted as Christ's "last will."

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Definitions of testament
1
testament (n.)
a profession of belief;
he stated his political testament
testament (n.)
a legal document declaring a person's wishes regarding the disposal of their property when they die;
Synonyms: will
testament (n.)
strong evidence for something;
his easy victory was a testament to his skill
2
Testament (n.)
either of the two main parts of the Christian Bible;
From wordnet.princeton.edu