I think you are looking for the term "prolonged", which a drought can be ~ some definitions suggest it's a prolonged period of abnormally low precipitation ~ but unless prolonged is defined, the Sahara is in a drought ~ a very long one in fact. Goes on for 100,005 years, with a 5,000 year break.
An 80 year drought cycle is pretty normal for the US ~ and it would be wrong to suggest that just because that's "normal" that no drought exists!
I guess my point is, when does a drought become subsumed as a principal part of the climate change cycle. Anyway, good points and info. I just cant get my mind around a 100,000 year drought; however, climate change over that period, seems more reasonable.