He has a prior engagement this evening.
Now what does it mean? Does it mean his engagement is going to happen before someone else or at first please explain.
It is implied that he has been asked/invited to do something this evening, but he already has an earlier, or "prior", engagement, so he cannot accept.
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It is implied that he has been asked/invited to do something this evening, but he already has an earlier, or "prior", engagement, so he cannot accept.