Meaning and Usage
The word 熱 (ねつ) primarily means "fever" or "body temperature" in a medical context. It is commonly used when talking about being sick or having a fever. For example, 熱がある means "to have a fever."
Extended Usage
Besides the physical meaning, 熱 can also describe enthusiasm or passion when used in compounds or expressions like 熱心 (ねっしん), meaning "enthusiastic" or "zealous." This usage is more abstract and relates to emotional intensity rather than physical heat.
Common Collocations
- 熱がある: to have a fever
- 熱が下がる: fever goes down
- 熱心に: enthusiastically, with passion
Register and Nuance
When used for fever, 熱 is neutral and common in everyday conversation. The enthusiastic meaning is often seen in more formal or written contexts but is also common in spoken Japanese.
Learner Tips
Be careful not to confuse 熱 (fever) with 暑い (あつい), which means "hot" in terms of weather or temperature. 熱 refers specifically to body temperature or metaphorical passion, not ambient heat.