Intense, passionate, and enthusiastic emotion or belief about something.
From Latin 'fervor' meaning 'heat' or 'boiling.' The Romans used this word literally for heat and hot liquids, but medieval Latin speakers extended it to mean the 'heat' of passion or intensity of feeling. This spelling with 'u' is the British version; Americans spell it 'fervor.'
The brilliant metaphor buried in 'fervour' is that passion is like heat—when you're really excited about something, we literally say you're 'hot under the collar' or 'fired up,' and this word comes directly from that ancient connection between heat and emotion.
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