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Pronunciation varies by accent · noun
(geography) A line connecting places on the Earth's surface that have the same mean frequency of auroras..
Use isochasm when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Isochasm means (geography) A line connecting places on the Earth's surface that have the same mean frequency of auroras..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use isochasm where its definition matches the intended context.
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