Elemental dignity (or is it dignitary?), each of the suits is associated with an element. Each of the elements seems to have an opposing element.
In the LWB that comes with the Thoth, the spread given (I believe it is the Golden Dawn spread...someone help me out here) groups the cards in groups of threes. The middle card is affected by the elements on either side of it, thus the elemental dignities.
(Edit: Added the following)
After getting off my lazy butt, here's the spread given in the LWB, in case you don't have it anymore:
13...9....5...................................................4...8...12
.............................2...1...3.......................................
14...10...6..................................................7...11...15
Card 1 represents the querent and the nature of the problem and primary influences.
Cards 2 and 3 in conjunction with card 1, are the key cards describing the nature of the situation and the personality of the querent.
Cards 13, 9, 5 and 4, 8 and 12 indicate two potentials for the future. If the complement one another then 13, 9 and 5 are a development of 4, 8 and 12. If they conflict, then 4, 8 and 12 are the path the puerent's path will naturally go unless action is taken to change this course. 13, 9 and 5 would be considered possibilities of alternative acton.
Cards 14, 10 and 6 assist the querent in making whatever decision is necessary. They indicate the psychological basis and implications of the issue.
Cards 7, 11 and 15 show forces operating beyond the querant's control - destiny or karma - to which the querent can adapt. These may constitute advice as well.