1. (n.) A state or sensation of being chilly; a disagreeable sensation of coldness.

2. (n.) A moderate degree of coldness; disagreeable coldness or rawness; as, the chilliness of the air.

3. (n.) Formality; lack of warmth.

algidity bitterness bleakness boiling point briskness chill chilliness cold coldness cool coolness coolth crispness cryogenics cryology decrease in temperature dew point freezing point freshness frigidity frostiness gelidity iciness inclemency intense cold keenness low temperature melting point nip nippiness rawness recalescence point rigor severity sharp air sharpness temperature zero