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Pronunciation varies by accent · noun
An event or activity that lasts for the whole of the day, or for all, or most, of the daylight hours of the day..
Use all-dayer when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
All-dayer means An event or activity that lasts for the whole of the day, or for all, or most, of the daylight hours of the day..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use all-dayer where its definition matches the intended context.
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