English Reference

Word

solar

Phoneticsso·lar

US/ˈsoʊɫɝ/

UK/sˈəʊlɐ/

Definitions

01related to the sun

B1 · Science

adj. connected with the sun or coming from the sun.

adj. pertaining to or proceeding from the sun. Usually non-gradable.

“The solar system includes the sun and all the planets that move around it.”

“Scientists observed a massive solar flare that released a burst of radiation toward the Earth's atmosphere.”

Usage

Usually placed before the noun it modifies.

Synonyms

heliocentric

Antonyms

02using sun power

B1

adj. using the energy from the sun to make electricity or heat.

adj. utilising or powered by solar radiation.

“Many houses now have solar panels on their roofs to save money on energy.”

“The government is investing heavily in solar technology to reduce the nation's reliance on fossil fuels.”

Synonyms

03solar energy

B2

n. energy or power that comes from the sun.

n. a shortened form of 'solar energy' or 'solar power'. Uncountable in this sense.

“We decided to switch to solar to help the environment.”

“The transition to solar has been faster than expected due to the falling cost of battery storage.”

Informal

Synonyms

sunlightrenewables

04medieval room

C2

n. a private upper room in a medieval house.

n. a private room or upper chamber in a medieval English house, often used by the family for privacy away from the main hall.

“The lord and lady of the castle slept in the solar above the great hall.”

“Architectural historians noted that the solar provided a rare degree of domestic privacy in an otherwise communal medieval structure.”

Archaic · Technical

Synonyms

Real-World Examples

“But we know that ours is the only planet in the solar system to have them.”
The Guardian · 11 Aug 2026
“If skies are clear, the Dark Space team will go to the harbour with their solar telescope.”
BBC News · 12 Aug 2026

Etymology

From Late Middle English solar, from Latin sōlāris, from sōl (“sun”), from Proto-Indo-European *sóh₂wl̥ (“sun”).

From Middle English solar, soler; from a conflation of Old English soler, solere (“raised platform; loft, upper room, upper part of a house, soler”), from Latin sōlārium; and Old English solor, salor (“residence, dwelling; hall; palace”), from Proto-West Germanic salaʀ, from Proto-Germanic salaz, *salą (“house, room, hall”). More at sale.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Collocations

solar eclipsesolar systemsolar panelssolar eclipsessolar filtersolar windsolar cellssolar corona

Domain

Astronomy

This entry

Level
B2 · Upper Intermediate
Frequency
Common
Updated

Scan code

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English Reference