English Dictionary

Heat, in a literal sense; as, the ardor of the sun's rays.
Source : opted (8579)  - auto

Warmth or heat of passion or affection; eagerness; zeal; as, he pursues study with ardor; the fought with ardor; martial ardor.
Source : opted (8580)  - auto

Bright and effulgent spirits; seraphim.
Source : opted (8581)  - auto