▪ I. † disˈreason, n. Obs.
In 5 desrayson.
[a. OF. desraison, f. des-, dis- 4 + raison reason.]
That which is contrary to reason or right; injustice.
| 1480 Caxton Ovid's Met. xii. xix, Certes it is to chyvalrye over grete blame, over grete tyrannye and desrayson. |
▪ II. † disˈreason, v. Obs.
[Anglicized from OF. desraisnier or its latinized form disrātiōnāre, variants of OF. deraisnier, med.L. dērātiōnāre: see Du Cange, and cf. deraign.]
trans. To prove, assert, vindicate; = deraign v. 1, 2.
(The prefix des-, dis-, was here a mere variant of de-, owing to the frequent equivalence and confusion of these prefixes (see de- I. 6); but it appears to have been taken by the 17th c. legal antiquaries in the privative sense (dis- 4); hence the erroneous explanation of Disrationare in Blount's Law Dict. ‘contrarium ratiocinando asserere, vel quod assertum est ratiocinando destruere’, and cf. J. C. Blomfield Hist. Souldern (1893) 12 note.)
| 1622 Malynes Anc. Law-Merch. 425 In which time the proprietarie may disreason the said recouerie, by disprouing the other parties surmises or allegations, prouing that the specialtie was paied whereupon the Attachment was grounded. |