Sentence:  The first step in creating <WSD>megapolitan</WSD> areas involved producing a map of the micropolitan and metropolitan counties. To be considered as a candidate for <WSD>megapolitan</WSD> inclusion, an area must be a string of contiguous metropolitan and micropolitan counties, uninterrupted by non-metropolitan counties. 
Meaning of the word marked with <WSD> tags:  Of or pertaining to a (complex).