lastly vs ultimately

lastly

adv
  • Used to mark the beginning of the last in a list of items or propositions. 

  • Used to signal that the speaker is about to yield control of the conversation. 

ultimately

adv
  • Indicating the last item. 

  • Indicating the most important action. 

  • Used to indicate the etymon at which a given etymological derivation terminates. 

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