rè​dù

fervor

热度 (熱度) rè​dù
fervor noun
metaphorical zeal, passion, or level of public interest and popularity

The popularity of this article on the internet has remained high.

fever noun
an abnormally high body temperature

He felt the child's forehead and noticed he still had a bit of a fever.

heat level noun
the degree or intensity of physical heat

The heat inside the Earth is incredibly intense.

Frequency

Movie subtitles
1.31 per million appears in 1% of films
Written text
3.21 per million

Sources

Definitions
CC-CEDICT