This is the 56th most frequent Icelandic word.
að
The Icelandic word "að" is a particle meaning "to" (used before infinitive verbs).
The preposition 'að' is used as an infinitive marker before the verb 'fara'.
Ég ætla að fara í bíó.
I am going to go to the cinema.
Here 'að' functions as a conjunction introducing a subordinate clause.
Hann sagði að hann myndi koma.
He said that he would come.
In this context, 'að' is used as part of the expression 'að lokum' meaning 'at the end'.