(EMOTION) [noun] [U] - a state of strong emotion, esp. excitement or anger"No, I did not do it, and I deny absolutely all your accusations," he replied with/without heat.John came up and apologised for the remarks he had made in the heat of the moment (= while he was angry/excited).
HEAT
Meaning of HEAT in English
Cambridge English vocab. Кембриджский английский словарь. 2012