What does advertence or advertency mean?
The definition of advertence and advertency
Ad*vert”ence, Ad*vert”en*cy,
Etym: [OF. advertence, avertence, LL. advertentia, fr. L. advertens. See Advertent.]

The act of adverting, of the quality of being advertent; attention; notice; regard; heedfulness. To this difference it is right that advertence should be had in regulating taxation. J. S. Mill.