"Ultimately, he will have to make a decision before the end of the week."
3.AdverbIn the end; finally.
4.AdverbUsed to indicate the etymon at which a given etymological derivation terminates.
"Cognate to Gottscheerish boßər, bàsser. Ultimately cognate to standard High German Wasser.; Shortened from maxiature, ultimately from Latin maximus ("large").; Ultimately from Latin equus ("horse")."