Your dictionary is incomplete. There are older senses of the term, rooted in the Latin etymology of ad-sumere, to "take on", "put on", to "take upon oneself".
-A8
3,078 posted on 12/29/2006 8:11:52 AM PST by adiaireton8
("There is no greater evil one can suffer than to hate reasonable discourse." - Plato, Phaedo 89d)