From the point of view of how electoral votes are decided (excluding faithless electors), it is determined by plurality, not majority. A state's electoral votes go to the candidate who receives the most votes (a plurality), not the one who receives more than half (a majority).
Re:US billionaire helped to back Brexit
by paulddraper on Sunday February 26, 2017 @12:18PM
(#13738328)
It's a majority of electoral college.
It's up to each state to choose their electors (plutority of popular vote, as you said being the most common, though not the only method).
The winner of the US presidential election must be elected by majority vote.
Of course, as long as we're hypothesizing the election to be by popular vote, we could make it by plutority too...