Sentence:  So, depending on how he chooses to govern over the next four years, Mr. Obama may yet have a chance to reset the stale debate in Washington, or at least to hasten the <WSD>transition</WSD> from one moment to the next. His re-election opens the door further for the post-'60s generation, even if it does not quite clear the room. 
Meaning of the word marked with <WSD> tags:  The process of change from one form, state, style or place to another.