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Definition of warmth : 1. A state of lively and excited interest; zeal; ardor; fervor; passion; enthusiasm; earnestness; as, the warmth of love or piety; he replied with much warmth.
2. The glowing effect which arises from the use of warm colors; hence, any similar appearance or effect in a painting, or work of color.
3. The quality or state of being warm; gentle heat; as, the warmth of the sun; the warmth of the blood; vital warmth.

Synonyms:

partiality, high temperature, congenialness, solicitude, cordialness, liberality, support, warmness, earnestness, genialness, caring, frenzy, congeniality, eighties, heating system, heating, eagerness, lovingness, zeal, excitement, passionateness, rage, mania, heating plant, white heat, agreeableness, passion, fanaticism, feelings, hot, geniality, agreeability, rut, tepidity, heart, centigrade, fancy, Fahrenheit, absolute zero, violence, ecstasy, excite, warmheartedness, pleasantness, tepidness, fervency, inspiration, fervidness, affectionateness, generosity, consideration, amiability, philia, cordiality, excitation, charity, heat energy, fervor, F., intensity, amenity, good, attitude, ardency, Celsius, rapture, C, vehemence, altruism, oestrus, affability, amiableness, sociability, boiling point, sociableness, ardor, degree, lukewarmness, bimetallic strip, emotion, extravagance, hospitality, intenseness, hotness, estrus, enthusiasm, cacoethes, transport

feeling, attachment, kindness, friendliness, love, liking, sympathy, regard, devotion, fondness, respect, tenderness, affection, friendship, sentiment

torridness, heat, glow, light, fire, temperature, fever, calefaction

Usage examples:

• And what warmth and light there was to look upon! - "A Man and a Woman", Stanley Waterloo.
• But in winter, at least, when you need warmth, you must have to fall back on our old friend the sheep. - "Equality", Edward Bellamy.
• The night was more chilly than the preceding one, and the warmth of the blankets would have been pleasant to both. - "The Lost Trail", Edward S. Ellis.