Solar/ˈsəʊlər/ Definition 1 of 3Pro Tip 1/3Astronomical Usage Used often in astronomy to discuss objects and phenomena related to the sun. Solar flares can disrupt satellite communications. Pro Tip 2/3Not Always Hot While 'solar' relates to the sun, it doesn't mean something is hot or warm. A solar eclipse can actually make the surroundings cooler. Pro Tip 3/3Figurative Expression Sometimes used metaphorically to describe someone central and important in a group. He was the solar figure in their circle of friends.