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Pronunciation varies by accent · noun
An airplane with four superposed main supporting surfaces (four wings one above the other).
Use quadruplane when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Quadruplane means An airplane with four superposed main supporting surfaces (four wings one above the other).
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use quadruplane where its definition matches the intended context.
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