What is the core body temperature more than is called fever? Thank you

What is the core body temperature more than is called fever? Thank you.

Fever is defined as a core body temperature above 38°C (100.4°F).

Some sources use 37.5°C (99.5°F) as the lower threshold, depending on the clinical context and measurement site, but 38°C is the most widely accepted cutoff in clinical medicine.

For reference:

Normal core temperature: ~36.5-37.5°C (97.7-99.5°F)
Low-grade fever: 38.0-38.4°C (100.4-101.1°F)
Fever: ≥38.5°C (101.3°F)
High fever: ≥39.5°C (103.1°F)
Hyperpyrexia (dangerously high): ≥41°C (105.8°F)

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