What is "conclusive presumption"

Presumption \Pre*sump"tion\ (?; 215), n. [L. praesumptio: cf. F. pr['e]somption, OF. also presumpcion. See Presume.]

1. The act of presuming, or believing upon probable evidence; the act of assuming or taking for granted; belief upon incomplete proof.

2. Ground for presuming; evidence probable, but not conclusive; strong probability; reasonable supposition; as, the presumption is that an event has taken place.

3. That which is presumed or assumed; that which is supposed or believed to be real or true, on evidence that is probable but not conclusive. ``In contradiction to these very plausible presumptions.''
   --De Quincey.

4. The act of venturing beyond due beyond due bounds; an overstepping of the bounds of reverence, respect, or courtesy; forward, overconfident, or arrogant opinion or conduct; presumptuousness; arrogance; effrontery.

   Thy son I killed for his presumption.
   --Shak.

   I had the presumption to dedicate to you a very unfinished piece.
   --Dryden.

   Conclusive presumption. See under Conclusive.

   Presumption of fact (Law), an argument of a fact from a fact; an inference as to the existence of one fact not certainly known, from the existence of some other fact known or proved, founded on a previous experience of their connection; supposition of the truth or real existence of something, without direct or positive proof of the fact, but grounded on circumstantial or probable evidence which entitles it to belief.
   --Burrill.
   --Best.
   --Wharton.

   Presumption of law (Law), a postulate applied in advance to all cases of a particular class; e. g., the presumption of innocence and of regularity of records. Such a presumption is rebuttable or irrebuttable.

Conclusive \Con*clu"sive\, a. [Cf. F. conclusif.] Belonging to a close or termination; decisive; convincing; putting an end to debate or question; leading to, or involving, a conclusion or decision.

Secret reasons . . . equally conclusive for us as they were for them.
--Rogers.

Conclusive evidence (Law), that of which, from its nature, the law allows no contradiction or explanation.

Conclusive presumption (Law), an inference which the law makes so peremptorily that it will not allow it to be overthrown by any contrary proof, however strong.

Syn: Final; ultimate; unanswerable. See Final.

n. (context legal English) A matter that deemed by law to be true, and therefore provides no opportunity for evidence to the contrary to be presented.

A conclusive presumption (in Latin, praesumptio iuris et de iure), also known as an irrebuttable presumption, is a type of presumption used in several legal systems.