Meaning

• Indicating the last item.

  "Firstly,… Secondly,… Ultimately,…"

• Indicating the most important action.

  "Ultimately, he will have to make a decision before the end of the week."

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

  "Cognate to Gottscheerish boßər, bàsser. Ultimately cognate to standard High German Wasser."