Sentence:  Rethinking the revolution issue is therefore the key to any novel interpretation, but it needs to be addressed in a more <WSD>diachronic</WSD> and synchronic fashion, comparing the "Wende" to earlier German upheavals and to the concurrent transformation of East Central Europe. 
Meaning of the word marked with <WSD> tags:  Of, pertaining to or concerned with changes that occur over time.