Re:Donald Trump’s Contract with the American Voter [pdf]
by grzm on Thursday November 10, 2016 @07:30AM
(#12919827)
The Wikipedia article indicates that simple majority may refer to majority, plurality, FPTP, or super majority, indicating no preference as to which might might be the most commonly understood.
Wikipedia [0] also recognizes this meaning.
[0] https://en.wikipedia.org/wiki/Simple_majority