ついに
Usage
The adverb つに indicates that something happens or something expected doesn't happens after:
waiting for it
longing for it
expecting it to happen
making an effort to make it happen
after struggling/suffering in a hard situation for a long time. At last; finally; int the end; after all
Examples
四年間頑張って勉強して、ついに卒業の日が来た。
After 4 years of giving my best the graduation day finally came.
2007年の夏、子供たちはついにハリーポッターの最後のストーリーを読むことが出来た。
In the summer of 2007, children were at last were able to read the last story of Harry Potter.