What does one-day mean?
One-day means lasting one day.
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Pronunciation varies by accent · adjective
lasting one day.
one-day conference
one-day cricket match
On the morning after the one-day strike, October 4, one of the Type 4s on crew-training, No. D169, was appropriated to head the 3 a.m. mail to Hull, as no steam locomotive had been lit up and the usual Hull Type 3 was not available; [...].
Use one-day when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
One-day means lasting one day.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
one-day conference
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