What does 'coll.' represent in a legal document?
e.g.: of the Act No. 258/2000 Coll.,

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It should stand for "Collection".

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Thanks.

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Given that you are Hugarian you may be picking this up from an EU source.  The EU offers a great website to translate languages used within the EU for this sort of technical stuff.  http://iate.europa.eu/SearchByQuery.do There are 4 possible meanings of this term EU English -> English.
College, Collection of Laws, Collision, Collection. of these the second is the most likely.