about time vs meanwhile

about time

adv
  • Used other than figuratively or idiomatically: see about, time. 

  • Far past the desired time. 

  • Close to the right time. 

meanwhile

adv
  • During the time that something is happening. 

  • At the same time, but elsewhere. 

  • In contrast or opposed to aspects previously mentioned. 

noun
  • The time between two events. 

How often have the words about time and meanwhile occurred in a corpus of books? (source: Google Ngram Viewer )