What does that mean? Debate watchers look up lingopublished at 09:26 British Summer Time 27 September 2016
Dictionary publisher Merriam-Webster says "stamina", "temperament" and "braggadocio" are the top trending words on its website after being used in the presidential debate.
Mr Trump used the word braggadocious in the debate. Merriam-Webster says the word is not common enough to feature in its dictionary.
"It is thought to have come from braggadocio (also not a common word today), which is considerably older," it says.
"This term, which currently means 'the annoying or exaggerated talk of someone who is trying to sound very proud or brave' began to be used in the beginning of the 17th century, at which point it simply referred to a braggart."
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