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/ˈskaɪˌɡloʊ/ · noun
The illumination of the sky above populated areas, mostly by street lighting..
Use skyglow when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Skyglow means The illumination of the sky above populated areas, mostly by street lighting..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use skyglow where its definition matches the intended context.
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