at

that · conjunction

Definition: Used to introduce a subordinate clause, often expressing belief, knowledge, emotion, or to report speech. It can also function as a conjunction introducing infinitives or comparisons.
Origin: From Old Norse 'at', a very common conjunction with similar functions. It has ancient Germanic roots, related to words in other Germanic languages that introduce subordinate clauses or serve as prepositions.

Examples

Jeg tror at han kommer snart.	I believe that he is coming soon.
Hun sa at hun var sliten.	She said that she was tired.
Det er viktig at du lytter.	It is important that you listen.
Han virker gladere enn at han pleier å være.	He seems happier than he usually is.
Det er deilig å se deg igjen, og enda deiligere å vite at du har det bra.	It's lovely to see you again, and even lovelier to know that you are doing well.