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Pronunciation varies by accent · noun
The upper part of the atmosphere, above about 60 miles or 100 km, in which there is great variation in its composition..
Use heterosphere when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Heterosphere means The upper part of the atmosphere, above about 60 miles or 100 km, in which there is great variation in its composition..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use heterosphere where its definition matches the intended context.
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