What does aglow mean?
"Aglow" is an adjective describing something that shines with light or warmth, whether literally — embers aglow in a fireplace, windows aglow at dusk — or figuratively, as when a person's face is aglow with joy, pride, or excitement. It functions almost exclusively after a verb rather than directly before a noun, so English speakers say "the room was aglow" rather than "the aglow room." The word derives from Middle English "a" (meaning "in" or "on") combined with "glow," literally meaning "in a state of glowing." Its connotations are almost invariably positive and evocative, lending it a slightly poetic, atmospheric quality that makes it a favorite in descriptive prose about firelight, sunsets, celebrations, and emotional high points. It is a compact, vivid alternative to longer phrases like "shining brightly" or "radiating happiness."
Glowing with light or warmth.
"The horizon was aglow with the last rays of sunset."
Almost always used predicatively rather than attributively.
Radiant with emotion, such as joy, pride, or excitement.
"She was aglow with pride at her daughter's graduation."
"Aglow" began life as two separate words — "on glow" — and English fused them so tightly that most speakers have no idea they're saying a preposition every time they describe a candlelit dinner.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of aglow
"Aglow" formed in Middle English from the prefix "a-" (from Old English "an"/"on," meaning "in" or "on") joined to the verb "glow," which descends from Old English "glōwan." The construction parallels other fossilized phrases like "ablaze" and "afire." Its Germanic root connects it to related words such as "gloom" and to cognate forms in other Germanic languages.
How aglow is actually used
Predicative use dominates — "aglow" rarely appears before a noun (*"an aglow face" is unidiomatic); instead one says "a face aglow with happiness." It carries warm, positive connotations and leans slightly literary or descriptive in register.
Easily confused with aglow
"A glow" is the noun referring to the light itself, while "aglow" is an adjective describing something that emits or appears suffused with that light.