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Pronunciation varies by accent · adjective
That is lighter than air, describing materials or aircraft..
Use lighter-than-air when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Lighter-than-air means That is lighter than air, describing materials or aircraft..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use lighter-than-air where its definition matches the intended context.
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