I would say it is an offense.
Penal Law section 10(1) defines Offense as:
1. "Offense" means conduct for which a sentence to a term of imprisonment or to a fine is provided by any law of this state or by any law, local law or ordinance of a political subdivision of this state, or by any order, rule or regulation of any governmental instrumentality authorized by law to adopt the same.
Disorderly Conduct carries a 15 jail sentence. In addition, Article 240 is entitled OFFENSES AGAINST PUBLIC ORDER.
Depending on the situation, you may have ground to move to vacate the conviction but that would re-instate the original charge. Maybe the witness is no longer around.
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It is an offense though not a crime. It was also an arrest and maybe you were jailed before the arraignment.
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It is a Penal Law Offense. Under some circumstances, CPL 160.55 allows you to say it never happened and you should check that provision. That statute also indicates that your criminal record on this case is sealed but your court file is not. You may wish to try to vacate your conviction under CPL Sec. 440.10(1)(h) because of what your lawyer said to you about the effect of this. I would have to know more about the case to figure that out.