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Pronunciation varies by accent · noun
(rare) The property or state of being supermassive..
Use supermassiveness when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Supermassiveness means (rare) The property or state of being supermassive..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use supermassiveness where its definition matches the intended context.
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