
n. since a presumption is an assumption of fact accepted by the court until disproved, all presumptions are rebuttable. Thus rebuttable presumption is a redundancy.
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http://dictionary.law.com/Default.xhtml?selected=1737

Both in common law and in civil law, a rebuttable presumption (in Latin, praesumptio iuris tantum) is an assumption made by a court, one that is taken to be true unless someone comes forward to contest it and prove otherwise. For example, a defendant in a criminal case is presumed innocent until proved guilty. A rebuttable presumption is often ass...
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http://en.wikipedia.org/wiki/Rebuttable_presumption

(n) Rebuttable presumption is used to represent the absoluteness of rejecting a presumption whenever an evidence proves contrary.
Found on
http://www.encyclo.co.uk/local/21213

An assumption of fact accepted by the court to be true unless someone proves it to be untrue. A rebuttable presumption is often drawn from prima facie evidence.
Found on
http://www.nolo.com/dictionary/rebuttable-presumption-term.html
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