The Collaborative International Dictionary
Obsignate
Obsignate \Ob*sig"nate\, v. t. [L. obsignated, p. p. of
obsignare to seal. See Ob-, and Sign.]
To seal; to ratify. [Obs.]
--Barrow.
Wiktionary
obsignate
vb. (context obsolete English) To seal; to ratify.