We would have to have more details to give you an intelligent answer.
NY Criminal defense Attorney
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Your question does not contain information to give you a good answer. All dismissals are at the discretion of the prosecutor. With a few exceptions, a prosecutor can always refile a dismissed case and revive the charge anytime within the statute of limitations. The statute of limitations is two years for most all misdemeanors.
I agree with Mr. Medley.
If you are concerned about this case being re-filed, discuss that with your lawyer.
If you did not have a lawyer for this case, then you should take the papers to a reputable criminal defense lawyer at this point for advice about what they mean. The cost of that is probably zero because most criminal defense lawyers don't charge for the first visit.
Answers on Avvo are for general information purposes only and should not be relied upon as legal advice. No attorney / client relationship is created by providing this answer. For specific advice about your situation, you should consult a competent attorney of your choosing.