- the state or quality of having, giving off, or keeping in a moderate degree of heat
- the degree of heat in a substance, esp. when it is moderate; mild heat
- excitement or vigor of feeling; enthusiasm, ardor, zeal, etc.
- sympathetic, cordial, or affectionate feelings or nature
- slight anger
- a glowing effect obtained by using red, yellow, etc.
Origin of warmthMiddle English wermthe: see warm and -th