solar

adj

1. (not-comparable)Of or pertaining to the sun; proceeding from the sun.

   “solar light”

   “solar rays”

   “solar influence”

2. (not-comparable, obsolete)Born under the predominant influence of the sun.

   “and proud beside, as solar people are”

3. (not-comparable)Measured by the progress or revolution of the sun in the ecliptic; as, the solar year.
4. (not-comparable)Produced by the action of the sun, or peculiarly affected by its influence.

   “They denominate some herbs solar, and some lunar.”

   “Nor is solar power yet as cheap as the grid.”

5. (not-comparable)Employing solar power.

   “a solar furnace”

6. (alt-of, not-comparable)Alternative letter-case form of solar (“pertaining to the Sun (the star Sol)”).

   “We have not yet the instruments that we want for that work, but I have asked for a Solar spectrograph, and I am already in the preliminary talkings to order a spectroheliograph […]”

   “Values at the Solar location (Merrifield, 1992) are denoted by the subscript ○, and the present epoch is t ≡ 0, […]”

   “Here our knowledge is somewhat more certain, especially in the local Solar neighbourhood.”

   “Data on absolute values of Solar flux in the wave-range λ < 130nm and in the hydrogen line L_α (λ = 121.6nm) were obtained on-board both CORONAS satellites.”

noun

1. (abbreviation, alt-of, ellipsis, uncountable)Ellipsis of solar energy.

   “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.”

2. (uncountable)A fictional currency used in science fiction.
3. (historical)A loft or upper chamber forming the private accommodation of the head of the household in a medieval hall; a garret room.