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Pronunciation varies by accent · noun
(obsolete) An early name for the element neptunium, based on a discredited claim of discovery..
Use sequanium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Sequanium means (obsolete) An early name for the element neptunium, based on a discredited claim of discovery..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use sequanium where its definition matches the intended context.
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