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/ˈd͡ʒiːəʊˌspeɪs/ · noun
The region of outer space near Earth, including the upper atmosphere, ionosphere and magnetosphere..
Use geospace when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Geospace means The region of outer space near Earth, including the upper atmosphere, ionosphere and magnetosphere..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use geospace where its definition matches the intended context.
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