Seems to mean, literally, to confound and disorder, or to turn out of course, or displace; as deraignment or de-parture out of religion, in St. 31 Hen. VIII. c. 6. In the common law, the word is used generally in the sense of to prove; viz., to deraign a right, dernlgn the warranty, etc. Glanv. lib. 2, c. 6; Fitzh. Nat. Brev. 146. Perhaps this word “deraign," and the word “deraignment,” derived from it, may be used in the sense of to prove and a proving, by disproving of what is asserted in opposition to truth and fact. Jacob
Source: Black's Law Dictionary 2nd Ed (1910)
