Definition of "solar"

solar¹

/ˈsoʊlɚ/

adjective
not comparable
1. Of or pertaining to the sun; proceeding from the sun
2. (astrology, obsolete) Born under the predominant influence of the sun.
  Quotations
  and proud beside, as solar people are
  1700, [John] Dryden, “The Cock and the Fox: Or, The Tale of the Nun’s Priest, from Chaucer”, in Fables Ancient and Modern; […], London: […] Jacob Tonson, […]
3. Measured by the progress or revolution of the sun in the ecliptic; as, the solar year.
4. Produced by the action of the sun, or peculiarly affected by its influence.
  Quotations
  They denominate some herbs solar, and some lunar.
  1631, Francis [Bacon], “(please specify |century=I to X)”, in Sylua Syluarum: Or A Naturall Historie. In Ten Centuries. […], 3rd edition, London: […] William Rawley; [p]rinted by J[ohn] H[aviland] for William Lee […]
  Nor is solar power yet as cheap as the grid.
  2013 July 20, “Out of the gloom”, in The Economist, volume 408, number 8845
noun
uncountable
1. solar energy
  Quotations
  He’s a player in robots and solar, cryptocurrency and climate, brain-computer implants to stave off the menace of artificial intelligence and underground tunnels to move people and freight at super speeds.
  December 13 2021, Molly Ball, Jeffrey Kluger, Alejandro de la Garza, “Elon Musk: Person of the Year 2021”, in Time Magazine‎

solar²

/ˈsoʊlɚ/

noun
plural solars
1. (obsolete) A loft or upper chamber forming the private accommodation of the head of the household in a medieval hall; a garret room.