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/ˈskulˌdeɪ/ · noun
A day during which the public schools are open, usually synonymous with weekday during the school year..
In modern China, Sunday is not usually a schoolday except around major holidays.
I couldn't contact my child during the schoolday because of the school's no-cellphone policy.
The schoolday starts at 9:00 am and ends at 3:00 pm.
Use school day when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
School day means A day during which the public schools are open, usually synonymous with weekday during the school year..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
In modern China, Sunday is not usually a schoolday except around major holidays.
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