different between ultimately vs definitely

English

ultimate +? -ly

ultimately (not comparable)

Indicating the last item.
Synonyms: at last, finally, in the end; see also Thesaurus:lastly
Indicating the most important action.
Synonyms: at the end of the day, when all is said and done; see also Thesaurus:fundamentally
(linguistics) Used to indicate the etymon at which a given etymological derivation terminates.
Synonym: terminal etymon

definite +? -ly

definitely (comparative more definitely, superlative most definitely)

Without question and beyond doubt.
She said she wasn't coming, definitely.
In a definite manner; decisively.
- 1912, Joseph Conrad, A Personal Record Chapter IV
  It was really impossible on board that ship to get away definitely from Almayer
- 1916, Claud Field (translator), Nikolai Gogol, The Nose, (1836)
  And the Nose definitely turned away.
- 2003, Herbert Mitgang, Once Upon a Time in New York (page 187)
  And these Elders were men of good standing in that community, and they swore definitely before the counsel that this lady committed this impropriety, and there was nobody to gainsay that, except the lady herself, […]

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