RPM of Evolgen disagrees with my definition of synteny! This is terribly distressing. Especially since, strictly speaking, he is precisely correct. The word has evolved in its usage from the pure form that RPM is describing to a more colloquial, pragmatic, somewhat sloppier sense as used by people looking at comparative genomics rather than classical Drosophila genetics.
If you read contemporary evo-devo papers, my definition is more useful in comprehending what they’re saying. If you want to read Drosophila genetics papers, you better know what RPM is talking about, or god help you (and there is no god).